Early Elementary - Addition WorkText

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Early Elementary

Addition

WorkText

Release 6

A+ TutorSoft

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Copyright © 2011 A+ TutorSoft Inc., All Rights Reserved.

No part of this publication may be reproduced, distributed, or transmitted in any

form or by any means, including photocopying, recording, or other electronic ormechanical method, without the prior written permission of A+ TutorSoft Inc.

Printed in the United States of America

2011, 2012




ABOUT THE WORKTEXT,This book is designed to be used as a supplement to teach addition using various methods to students in

early elementary years. It contains core MATH concepts, Worksheets, and Worksheets Answer Key.

Please use the space provided under each problem on the worksheets to show your work. We highlyencourage you to use this space to list the step-by-step process your student follows in arriving at theirsolution.

The main subject areas covered for this worktext are:1.1 Introduction to Addition1.2 Addition Using Objects1.3 Addition Using an Addition Table1.4 Addition Using Regrouping1.5 Find 10 More1.6 Commutative Property of Addition1.7 Associative Property of Addition

1.8 Additive Identity Property of Addition1.9 True or False1.10 Find the Missing Number1.11 Addition with Carrying Numbers1.12 Adding a 2-digit Number and a 1-digit Number1.13 Adding a 2-digit Number and a 2-digit Number1.14 Adding a 3-digit Number and a 2-digit Number1.15 Adding a 3-digit Number and a 3-digit Number1.16 Adding 3 Number Sets




Acknowledgement: A+ TutorSoft would like to thank all the individuals who helped research, write, develop, edit,and launch our MATH Curriculum products. Countless weeks, years, and months have been

devoted to the production of A+ TutorSoft Interactive MATH Curriculum and our printed texts;for this we thank everyone who contributed in making these products a reality.




TABLE OF CONTENTS

BookChapter 1.0 – Addition …………………………………………………..………………….... 9

Chapter 1.1 Introduction to Addition …………………………………………….………………. 10Chapter 1.2 Addition Using Objects …………………………………………………………… 15Chapter 1.3 Addition Using an Addition Table ………………………………………………. 17Chapter 1.4 Addition Using Regrouping …………………………...………………………… 21Chapter 1.5 Find 10 More …………………………………………………………………...... 27Chapter 1.6 Commutative Property of Addition ……….……………………………………. 31Chapter 1.7 Associative Property of Addition ……………………………………………….. 34Chapter 1.8 Additive Identity Property of Addition ………….………………………….…… 39Chapter 1.9 True or False ……………………….…………………………………………….. 43Chapter 1.10 Find the Missing Number ……………………………………………………… 46Chapter 1.11 Addition with Carrying Numbers …………………………………………….… 49Chapter 1.12 Adding a 2-digit Number and a 1-digit Number ……………………………… 52

Chapter 1.13 Adding a 2-digit Number and a 2-digit Number ………………….………..… 54Chapter 1.14 Adding a 3-digit Number and a 2-digit Number …………..……………..….. 56Chapter 1.15 Adding a 3-digit Number and a 3-digit Number ……………………...……… 59Chapter 1.16 Adding 3 Number Sets …………..………………….……………………….… 62

WorksheetsWorksheet 1 – 1.1 Introduction to Addition ………………………………………….…………. 67Worksheet 2 – 1.2 Addition Using Objects …………….……………………………………. 69Worksheet 3 – 1.3 Addition Using an Addition Table …………….……….……………....... 71Worksheet 4 – 1.4 Addition Using Regrouping …………..…………………………………. 73Worksheet 5 – 1.5 Find 10 More ………….…………………………………………..………. 75

Worksheet 6 – 1.6 Commutative Property of Addition …………..……………..…….….… 77Worksheet 7 – 1.7 Associative Property of Addition ……………….……………………….. 79Worksheet 8 – 1.8 Additive Identity Property of Addition …………….…………….………. 81Worksheet 9 – 1.9 True or False ……………….……………………..…………………...…. 83Worksheet 10 – 1.10 Find the Missing Number ………………………………………...…. 85Worksheet 11 – 1.11 Addition with Carrying Numbers ………….…………………….……. 87Worksheet 12 – 1.12 Adding a 2-digit Number and a 1-digit Number ……………….……. 89Worksheet 13 – 1.13 Adding a 2-digit Number and a 2-digit Number ……………..…..…. 91Worksheet 14 – 1.14 Adding a 3-digit Number and a 2-digit Number …………………….. 93Worksheet 15 – 1.15 Adding a 3-digit Number and a 3-digit Number ……….…….…..…. 95Worksheet 16 – 1.16 Adding 3 Number Sets …………..…..…………………………..…… 97

Worksheets Answer KeyWorksheet 1 – 1.1 Introduction to Addition ………………………………………….…………. 103Worksheet 2 – 1.2 Addition Using Objects …………….……………………………………. 103Worksheet 3 – 1.3 Addition Using an Addition Table …………….……….……………....... 103Worksheet 4 – 1.4 Addition Using Regrouping …………..…………………………………. 104Worksheet 5 – 1.5 Find 10 More ………….…………………………………………..………. 104Worksheet 6 – 1.6 Commutative Property of Addition …………..……………..…….….… 104




Worksheet 7 – 1.7 Associative Property of Addition ……………….……………………….. 105Worksheet 8 – 1.8 Additive Identity Property of Addition …………….…………….………. 105Worksheet 9 – 1.9 True or False ……………….……………………..…………………...…. 105Worksheet 10 – 1.10 Find the Missing Number ………………………………………...…. 106Worksheet 11 – 1.11 Addition with Carrying Numbers ………….…………………….……. 106Worksheet 12 – 1.12 Adding a 2-digit Number and a 1-digit Number ……………….……. 106

Worksheet 13 – 1.13 Adding a 2-digit Number and a 2-digit Number ……………..…..…. 107Worksheet 14 – 1.14 Adding a 3-digit Number and a 2-digit Number …………………….. 107Worksheet 15 – 1.15 Adding a 3-digit Number and a 3-digit Number ……….…….…..…. 107Worksheet 16 – 1.16 Adding 3 Number Sets …………..…..…………………………..…… 108




1.0 Addition

In this book we will discuss the following main topics:

Introduction to Addition Addition Using Objects Addition Using an Addition Table Addition Using Regrouping Find 10 More Commutative Property of Addition Associative Property of Addition Additive Identity Property of Addition True or False Find the Missing Number Addition with Carrying Numbers

Adding a 2-digit Number and a 1-digit Number Adding a 2-digit Number and a 2-digit Number Adding a 3-digit Number and a 2-digit Number Adding a 3-digit Number and a 3-digit Number Adding 3 Number Sets




1 – 1 Introduction to Additon Addition means we put 2 things together to make more.

Addition is a lot like counting.

Let me show you what I mean. Let’s say you have 2 cookies on your plate.

Then your Mom puts 2 more cookies on your plate. Now, how many cookies do youhave?

How many cookies do you have?

Right! Two cookies together with another 2 cookies makes 4 cookies. We can easilycount them. Count with me, ready? 1, 2, 3, 4. We now have 4 cookies. Great job!

In math, there is a certain way we write this. First, the symbol we use for addition is aplus sign.




Symbol for addition:

Then when we have the answer, we say equal to.Answer:

We can write our problem using the plus sign and equal sign along with our numbers.So, 2 cookies together with 2 cookies makes 4 cookies…

can be written as 2 cookies + 2 cookies = 4 cookies, or

2 + 2 = 4.

Addition using counting:We can use counting to add two numbers together. Let’s add 2 yellow blocks to 3 blueblocks by counting them.

First, we count the yellow blocks, 1, 2. Then continue counting the blue blocks. 3, 4,5. So, 2 + 3 = 5.




How many blocks are here?

Excellent! We need to add 3 blue blocks and 2 yellow blocks. Let’s count themtogether. 1, 2, 3, 4, 5. So, 3 + 2 = 5. Great job!


Great job! There are 6 blocks. We need to add 2 yellow blocks to 4 blue blocks. Let’scount them together. 1, 2, 3, 4, 5, 6. So, 2 + 4 = 6. You are doing great, keep it up!





Awesome! There are 6 blocks. We need to add 4 blue blocks to 2 yellow blocks. Let’scount them together. 1, 2, 3, 4, 5, 6. So, 4 + 2 = 6.


Very good! There are 6 blocks. We need to add 3 yellow blocks to 3 blue blocks.Let’s count them together. 1, 2, 3, 4, 5, 6. So, 3 + 3 = 6.

Let’s solve two more problems. How many blocks are here?


Yes! There are 7 blocks. We need to add 3 yellow blocks to 4 blue blocks. Let’scount them together. 1, 2, 3, 4, 5, 6, 7. So, 3 + 4 = 7. Fabulous job!

Last one! How many blocks are here?





Excellent! There are 9 blocks. We need to add 4 yellow blocks to 5 blue blocks. Let’scount them together. 1, 2, 3, 4, 5, 6, 7, 8, 9. So, 4 + 5 = 9.

You did a great job! It is very important you memorize your addition facts. Once youhave them memorized, it is easier to solve math problems, so keep practicing!




1 – 2 Additon Using Objects Let’s practice adding objects.

What is the total number of suns?

Great job! There are a total of 7 suns.

What is the total number of lightning bolts?

Awesome job! There are a total of 8 lightning bolts.

What is the total number of clouds?

You are doing great! Keep it up! There are a total of 8 clouds.




What is the total number of hearts?

Great job! There are a total of 9 hearts.

What is the total number of smiley faces?

Very good! There are a total of 12 smiley faces.

You did a great job! If you need more practice, be sure to play this lesson again andkeep practicing. Remember, it is very important you remember your addition facts.Once you have them memorized, it is easier to solve math problems so keeppracticing.




1 – 3 Addition Using an Additon Table An addition table can help you find answers to simple addition problems. It is veryimportant that you memorize all your addition facts, if you haven’t already, since youwill use them a lot in math.

Now let me show you how to add using an addition table.Let’s solve 2 + 3.

First, take your pointer finger on your right hand and go across the pink line and findthe number 2. Then, take your pointer finger on your left hand and go down the blueline and find the number 3. Then, move both of your fingers until they meet on thesame number. You should stop on the number 5. So, 2 + 3 = 5.

It’s that easy. Let’s try another problem. What is 3 + 4?




Very good! 3 + 4 = 7.

What is 5 + 3?

You got it! 5 + 3 = 8.

What is 6 + 2?

Great job! 6 + 2 = 8.






Very good! 8 + 5 = 13.

What is 9 + 8?

Great job! 9 + 8 = 17.

You should be able to find the sum of any two numbers using this chart. Remember, itis important to memorize each of these addition facts so keep practicing.




1 – 4 Additon Using Regrouping There are many times we need to add numbers that are larger than just 1 digit. If younotice, the number 10 is the largest number on our addition chart.

What if we needed to find the answer to 18 + 6?

Well, this is when we can use a strategy called regrouping . First, we have to rewrite theproblem like this: 18 + 6.

18+ 6

Notice that we stack one number on top of the other, lining up the one’s place. This is veryimportant, be sure the numbers on the far right are lined up. Now, we add the numbers 8

and 6 in the one’s place first. This is when you can use the addition table.

What is 8 + 6?

18 + 6




Very good, 8 + 6 = 14. So, we have 14 ones. Let’s plug this into my handy place valuechart.

Now, we move on to the next column, the ten’s place. There is only one number, 1. So,how many tens do we have?

18+ 6

Right, we have 1 ten. Let’s put this in our chart.

Now we can regroup. This means we can trade up any tens that we have in our columns.Let’s start in our one’s column. Here we have a 1 for the ten’s digit, which means thereare 10 ones. We can trade up those 10 ones for 1 ten.




Now we have new numbers in our columns. The one’s column lost 10 ones, making only 4

ones left. The ten’s column gained 1 group of 10, making 2 tens.

So now we have the number 24. So, we used regrouping to find 18 + 6 = 24.

18+ 6

24

Let’s solve another problem using regrouping.

What is 27 + 6?

27+ 6




So, first we line up line up the one’s place. Then what do we do? Right, we add thenumbers 7 and 6 in the one’s place. This is when you can use the addition table.

What is 7 + 6?

27

+ 6

Very good, 7 + 6 = 13. So, we have 13 ones. Let’s plug this into my handy place valuechart.

Now, we move on to the next column, the ten’s place.

27+ 6




There is only one number, 2. So, how many tens do we have? Right, we have 2 tens.Let’s put this in our chart.

Now we can regroup, which means we trade up any tens we have in our columns. Let’s

start in our one’s column. Here we have a 1 for the ten’s digit, which means there are 10ones. We can trade up those 10 ones for 1 ten.

Now we have new numbers in our columns. The one’s column lost 10 ones, making only 3ones left. The ten’s column gained 1 group of 10, making 3 tens.




So what number did we end up with? Right, we now have the number 33. So, we usedregrouping to find 27 + 6 = 33.

27

+ 633

You did a great job! If you need more practice, be sure to review this lesson again andkeep practicing.




1 – 5 Find 10 More Now let’s practice adding 10 more to any number using mental math. Mental mathmeans we picture the problem in our heads and then solve it in our heads.

What do you think 10 more means?

Excellent! 10 more means we add 10.

So, 10 more than 1 means 10 + 1.

Now picture 10 + 1 in your head and think about how we know that 10 + 1 is equal tothe next number, which is 11. That’s how you solve a problem using mental math,great job!

Let’s try another. Ready? What is 10 more than 4?

Excellent job! 10 more than 4 means 10 + 4, which you pictured in your head. Youmight have then counted up from 10 four times and got 14. Like this, 10, 11, 12, 13,14.

You can also stack the numbers and add them in your head. 0 + 4 = 4 and 1 plusnothing is 1, so you get 14. If you picture this way in your head, be sure not to mix upthe one’s and ten’s places.




Let’s try another problem using this strategy. What is 10 more than 3?

Right! 10 more than 3 means 10 + 3.

So stack the numbers and add them in your head. 0 + 3 = 3 and 1 plus nothing is 1,which is 13. You are doing great!

What is 10 more than 9?


So stack the numbers and add them in your head. 0 + 9 = 9 and 1 plus nothing is 1,which is 19. Keep it up!

What is 10 more than 10?


Stack the numbers and add them in your head. 0 + 0 = 0 and 1 plus 1 is 2, which is20.




Another way to solve this problem in your head is to know than when adding 10 more,this means the ten’s place of the other number is increased by 1.

For example, what is 10 more than 23?

If we understand that we just need to add 1 to the ten’s place, then 2 + 1 is 3, so wehave 33.

Let’s check this by stacking the numbers and adding, 3 + 0 = 3 and 2 + 1 = 3. Wehave 33, the same number! So, now you know a quicker way to find 10 more.

Let’s try two more using the quick way. What is 10 more than 45?

Excellent job! If we add 1 to the ten’s place, then 4 + 1 is 5, which means 10 more

than 45 is 55.




Last one. What is 10 more than 76?

Excellent job! If we add 1 to the ten’s place, then 7 + 1 is 8, which means 10 morethan 76 is 86.

Great job! If you need more practice, be sure to review this lesson again and keepmemorizing your addition facts.




1 – 6 Commutative Property of Additon We have learned that addition means we bring two numbers together to make a newnumber.

For example, when we add 2 blocks to 3 blocks we get 5 blocks.

This is written as 2 + 3 = 5.

What happens when we switch the 2 and 3 around?

Let’s count the blocks to see if we get a different answer. Count them with me.

Ready? 1, 2, 3, 4, 5. We got the same answer!

So, 2 + 3 = 5 and 3 + 2 = 5.

No matter which way we add the numbers, they still equal 5. Let’s try another problem.





Great job! There are 8 blocks. Count them with me. 1, 2, 3, 4, 5, 6, 7, 8.


What happens if we switch the 3 and 5 around?

Right! We get the same answer. Let’s count them together. 1, 2, 3, 4, 5, 6, 7, 8.

So, 3 + 5 = 8 and 5 + 3 = 8.

Let’s do one more.





Great job! There are 10 blocks. Count them with me. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.


What happens if we switch the 6 and 4 around?

Right! We get the same answer. Let’s count them together. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.

So, 6 + 4 = 10 and 4 + 6 = 10.

In addition, no matter which way we add the numbers, they will always have the sameanswer.

You did a great job! If you need more practice, be sure to review this lesson again andkeep memorizing your addition facts!




1 – 7 Associative Property of Additon We have learned that addition means we bring two numbers together to make a newnumber, like 3 + 5 = 8.

and these two numbers will have the same answer even if they are switched around. 3+ 5 = 8 and 5 + 3 = 8.

But what if we have more than two numbers to add? Well, that is where we can use theassociative property of addition.

The associative property of addition is much like the commutative property of addition;however, the associative property of addition has more than two numbers.

The associative property of addition has more than two numbers.

It states that if I have three numbers to add, I will get the same answer if I added the firsttwo numbers and then the third number as if I added the last two numbers and then addedthe first number. Let me show you what I mean.

What is 3 + 5 + 5?

Right! 3 + 5 + 5 = 13. We can count the faces to find the answer. Ready? 1, 2, 3, 4,5, 6, 7, 8, 9, 10, 11, 12, 13. Great job!




We have learned that the order we add these numbers do not change the answer. So,5 + 3 + 5 and 5 + 5 + 3 also equals 13.

Since we know we can add the numbers in any order, we can add the second twonumbers first because we know that 5 + 5 makes 10. Then it is easier to add 3 + 10,which is 13.

What is 2 + 4 + 6?

Fabulous! 2 + 4 + 6 = 12. We can count the hearts to find the answer. Ready? 1, 2,3, 4, 5, 6, 7, 8, 9, 10, 11, 12. Great job!





2 + 4 + 6 = 124 + 6 + 2 = 12

6 + 4 + 2 = 12Since we know we can add the numbers in any order, we can add the second twonumbers first because we know that 4 + 6 makes 10. Then it is easier to add 2 + 10,which is 12.

What is 4 + 7 + 3?

Excellent! 4 + 7 + 3 = 14. We can count the fish to find the answer. Ready, count withme? 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14. Great job!


4 + 7 + 3 = 14




7 + 3 + 4 = 143 + 7 + 4 = 14


What is 3 + 2 + 8?

Excellent! 3 + 2 + 8 = 13. We can count the cookies to find the answer. Ready, countwith me? 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13. Great job!


3 + 2 + 8 = 132 + 8 + 3 = 138 + 2 + 3 = 13





You did a great job! If you need more practice, be sure to review this lesson again andkeep memorizing your addition facts!




1 – 8 Additive Identity Property of Additon Additive Identity Property of Addition states that anytime we add a 0 to a number, thenumber stays the same.

Additive Identity Property of Addition means,Any Number + 0 = The Original Number

The number DOES NOT change when you add 0 to it.

In math, any time we add zero to a number, the number still stays the same. Forexample, we have 4 cookies and we add 0 cookies, so how many cookies do we havein all?

Excellent! We still have 4 cookies. 4 + 0 = 4.

No matter how we add 0 and 4, it will always be 4. So, 0 cookies plus 4 cookies equals4 cookies, too. 0 + 4 = 4.




This works for any number you can think of. Let’s practice. Ready?

What is 2 + 0?

Great job! 2 + 0 = 2. 2 stays the same.

What is 0 + 7?

Very good! 0 + 7 = 7.

What is 9 + 0?

You are doing great! Keep it up! 9 + 0 = 9.

What is 10 + 0?

Excellent job! 10 + 0 = 10.






Two more.

What is 0 + 68?

Yes! 0 + 68 = 68.

Last one,What is 0 + 100?

Excellent! 0 + 100 = 100.

You did a fantastic job! If you need more practice, be sure to review this lesson againand keep memorizing your addition facts!




1 – 9 True or False Let’s continue practicing addition by determining if addition statements are true orfalse. For example,

Is this statement true or false, 6 = 6?

Yes, great job! 6 = 6 is true. When both sides of the equal sign have the same value,then the addition statement is true. 6 is the same as 6, so this statement is true.

Is 4 + 1 = 1 + 4 true or false?

Right, true! We have to add both sides. 4 + 1 = 5 and 1 + 4 = 5 and we have 5 = 5, sothis statement is true.





Excellent job! This statement is true. On the left side 2 + 6 = 8 and on the right side 5+ 3 = 8 and we have 8 = 8, so this statement is true.


Great job! This statement is false. On the left side 7 + 8 = 15 and on the right side 9 +5 = 14 and 15 does not equal 14, so this statement is false. This is a ‘not equal to’ sign.

Is 12 + 3 = 10 + 5 true or false?

Awesome! This statement is true. On the left side 12 + 3 = 15 and on the right side 5+ 10 = 15 and we have 15 = 15, so this statement is true.





You are doing a great job! This statement is false. On the left side 10 + 6 = 16 and onthe right side 8 + 7 = 15 and 16 does not equal 15, so this statement is false.


Really great job! This statement is true. On the left side 9 + 8 = 17 and on the rightside 8 + 9 = 17 and we have 17 = 17, so this statement is true.

You did a fantastic job! If you need more practice, be sure to review this lesson againand keep memorizing your addition facts!




1 – 10 Find the Missing Number We have learned that when both sides of the equal sign have the same value, then theaddition statement is true. For example, 2 + 3 = 3 + 2 is true because both sides equal

5.

Sometimes, one of the numbers is missing and we have to figure out what number it is.For example, 7 + 3 = some missing number . Do you know the missing number?

Excellent! The missing number is 10, 7 + 3 = 10.

Do you know the missing number in this addition statement, 4 + 8 = some

miss ing number + 4?

Great job! The missing number is 8. The best way to find the missing number is tofirst add the numbers on the left, 4 + 8 = 12. Now, look on the right side. What numbercan you add to 4 that makes 12? Right, 8! Great job!

Do you know the missing number in this addition statement, 9 + some m iss ing

number = 7 + 5?




Great job! The missing number is 3. The best way to find the missing number is to

first add the numbers on the right, 7 + 5 = 12. Now, look on the left side. What numbercan you add to 9 that makes 12? Right, 3! Excellent job!

Do you know the missing number in this addition statement, some miss ing

number + 7 = 8 + 9?

Awesome! The missing number is 10. The best way to find the missing number is tofirst add the numbers on the right, 8 + 9 = 17. Now, look on the left side. What numbercan you add to 7 that makes 17? Right, 10! Great job!

Do you know the missing number in this addition statement, 7 + 4 = 8 + some

miss ing number ?

Awesome! The missing number is 3. The best way to find the missing number is tofirst add the numbers on the left, 7 + 4 = 11. Now, look on the right side. What numbercan you add to 8 that makes 11? Right, 3! Great job!




Do you know the missing number in this addition statement, 11 + 4 = 10 + some

miss ing number ?

Awesome! The missing number is 5. The best way to find the missing number is tofirst add the numbers on the left, 11 + 4 = 15. Now, look on the right side. What

number can you add to 10 that makes 15? Right, 5! Great job!

You did a fantastic job! If you need more practice, be sure to review this lesson again

and keep memorizing your addition facts!




1 – 11 Additon with Carrying Numbers

Let’s look at another way to add larger numbers. This time we are going to carry. Letme show you what I mean.

For example,Let’s add 78 + 19.

78+ 19

Do you remember what column we add first? Great job! We start adding the one’scolumn first.

78 + 19

So, what is 8 + 9? Right, 8 + 9 = 17. This time let’s put 7 under the line in the one’splace then we carry the 1 over to the ten’s place and write it on top.

1

78+ 19

7

Do you remember what column we add next? Very good! We add the ten’s columnnext.

1

78+ 19

7

What is 1 + 7 + 1? Yes, 9. Let’s put 9 under the line in the ten’s place.

178

+ 1997

So, 78 + 19 = 97. Let’s try another pr oblem.




Let’s add 26 + 87.

Let’s start in the one’s column.

26 + 87

What is 6 + 7? Right, 6 + 7 = 13. So put 3 under the line in the one’s place, then carry the 1 over to the ten’s place and write it on top.

1

26+ 87

3

What do we do next? Right, we add the ten’s column.

1

26+ 87

3

1 + 2 + 8 = 11. Put 11 under the line to the left of the 3.

1

26+ 87113

So, 26 + 87 = 113. Let’s try one more problem.

Let’s add 76 + 28.

Let’s start in the one’s column.

76 + 28




What is 6 + 8? Right, 6 + 8 = 14. So put 4 under the line in the one’s place, then carry the 1 over to the ten’s place and write it on top.

1

76+ 28

4


1

76+ 28

4

1 + 7 + 2 = 10. Put 10 under the line to the left of the 4.

1

76+ 28104

So, 76 + 28 = 104.

Great job! If you need more practice, be sure to review this lesson again and keeppracticing.




1 – 12 Adding a 2-digit Number and a 1-digit Number

Now let’s practice adding a 2-digit number and a 1-digit number.

For example, let’s add 37 + 5.

37+ 5


37 + 5

So, what is 7 + 5? Right, 7 + 5 = 12. Let’s put the 2 under the line in the one’s place,then carry the 1 over to the ten’s place and write it on top.

1

37+ 5

2


1

37+ 5

2

3 + 1 = 4. Where do we put the 4? Yes, we put the 4 under the line in the ten’s place. 1

37+ 5

42

So, 37 + 5 = 42.




Let’s add 92 + 9.

92+ 9


92 + 9

So, what is 9 + 2? Right, 9 + 2 = 11. Let’s put 1 under the line in the one’s place, thencarry the other 1 over to the ten’s place and write it on top.

1

92+ 9

1


1

92

+ 91

1 + 9 = 10. Where do we put the 10? The 0 goes in the ten’s place and 1 goes in thehundred’s place.

1

92+ 9

101

So, 92 + 9 = 101.







For example, let’s add 29 + 15.

29+ 15

What column do we add first? Yes, we start adding the one’s column first.

29 + 15

9 + 5 = 14. Where do we put the 4? Right, we put the 4 under the line in the one’splace. Where do we put the 1? Yes, we carry the 1 over to the ten’s place and write iton top.

1

29+ 15

4


1

29+ 15

4

1 + 2 + 1 = 4. Where do we put the 4? Right, we put the 4 under the line in the ten’splace.

1

29+ 15

44




So, 29 + 15 = 44.

Let’s add 64 + 83.

64+ 83

What column do we add first? Yes, we start adding the one’s column first.

64 + 83

4 + 3 = 7. Where do we put the 7? Right, we put the 7 under the line in the one’splace.

64+ 83

7


64

+ 837

6 + 8 = 14. Where do we put the 4? Right, we put the 4 under the line in the ten’splace. Where do you put the 1? Very good, we put the 1 under the line in thehundred’s place.

64+ 83147

So, 64 + 83 = 147.







Let’s add 369 + 85. Let’s start in the one’s column.

369 + 85

What is 9 + 5? Right, 9 + 5 = 14. Where do we put the 4? Right, we put the 4 underthe line in the one’s place. Where do we put the 1? Very good, we carry the 1 over tothe ten’s place and write it on top.

1

369

+ 854


1

369+ 85

4

1 + 6 + 8 = 15. Where do we put 15? Yes, we put 5 under the line in the ten’s placeand carry the other 1 over to the hundred’s column and write it on top.

1 1

369+ 85

54

What do we do next? Right, we add the hundred’s column.

1 1

369+ 85

54

1 + 3 = 4. Let’s put 4 under the line in the hundred’s place.




1 1

369+ 85

454

So, 369 + 85 = 454. Let’s try another problem.


927 + 96

What is 7 + 6? Right, 7 + 6 = 13. Where do we put 13? Right, we put the 3 under theline in the one’s place and we carry the 1 over to the ten’s place and write it on top.

1

927+ 96

3


1

927+ 96

3

1 + 2 + 9 = 12. Where do we put 12? Yes, we put 2 under the line in the ten’s placeand carry the 1 over to the hundred’s column and write it on top.

1 1

927+ 96

23





1 1

927+ 96

23

1 + 9 = 10. Where do we put 10? Very good, we put 0 in the hundred’s place and 1 inthe thousand’s place.

1 1

927+ 961,023

So, 927 + 96 = 1,023.








664 + 125

4 + 5 = 9. Where do we put the 9? Right, we put the 9 under the line in the one’splace.

664+ 125

9


664+ 125

9

6 + 2 = 8. Where do we put 8? Yes, we put 8 under the line in the ten’s place.

664

+ 12589


664+ 125

89

6 + 1 = 7. Let’s put 7 under the line in the hundred’s place.

664+ 125

789

So, 664 + 125 = 789.





979 + 476

What is 9 + 6? Right, 9 + 6 = 15. Where do we put 15? Right, we put the 5 under theline in the one’s place and we carry the 1 over to the ten’s place and write it on top.

1

979+ 476

5


1

979+ 476

5

1 + 7 + 7 = 15. Where do we put 15? Yes, we put 5 under the line in the ten’s placeand carry the 1 over to the hundred’s column and write it on top.

1 1

979+ 476

55


1 1

979

+ 47655

1 + 9 + 4 = 14. Where do we put 14? Very good, we put 4 under the line in thehundred’s place and 1 in the thousand’s place.




1 1

979+ 476

1,455

So, 979 + 476 = 1,455.




1 – 16 Adding 3 Number Sets Adding 3 sets of numbers is no different than what we have been doing so far, exceptthere is one more number to add. So, let me show you how to add 3 sets of numbers.

Let’s add 24, 45, and 16.

24 45

+ 16

We still start in the one’s column just as before.

24

45 + 16

So, let’s add 4 + 5, which equals 9. Then 9 + 6 equals 15. Where do we put 15?Right, we put the 5 below the line in the one’s place and carry the 1 over to the ten’scolumn and put it on top.

1

24

45+ 16

5

Now, we add the ten’s column.1

24 45

+ 16 5

So, let’s add 1 + 2 + 4 + 1, which equals 8. Where do we put 8? Very good, we put 8under the line in the ten’s place.




1

24 45

+ 16

85

All of the numbers have been added. So, 24 + 45 + 16 = 85. That’s it. Let’s tryanother problem.

What is 196 + 85 + 42?

196 85

+ 42

We still start in the one’s column just as before.

196 85

+ 42

So, let’s add 6 + 5, which equals 11. Then 11 + 2 equals 13. Where do we put 13?

Right, we put the 3 below the line in the one’s place and carry the 1 over to the ten’splace and put it on top.

1

196 85

+ 423

Now, we add the ten’s column.

1

196 85

+ 423




So, let’s add 1 + 9, which is 10. Add 8, which makes 18 + 4, which equals 22. Wheredo we put 22? Very good, we put 2 under the line in the ten’s place and carry the other2 to the hundred’s column and put it on top.

2 1

196 85

+ 4223

Now, we add the hundred’s column.

2 1

196 85

+ 4223

2 + 1 = 3. Put 3 below the line in the hundred’s place.

2 1

196

85+ 42

323

All of the numbers have been added. So, 196 + 85 + 42 = 323.





Worksheets







Name:

Worksheet 1 Chapter 1.1 Introduction to Addition

Q1. How many blocks are here?

Your answer is:


Your answer is:


Your answer is:


Your answer is:


Your answer is:





Your answer is:


Your answer is:


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Your answer is:


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Name:

Worksheet 2 Chapter 1.2 Addition Using Objects

Q1. How many cookies are here?

Your answer is:

Q2. How many carrots are here?

Your answer is:

Q3. How many watermelons are here?

Your answer is:

Q4. How many cherries are here?

Your answer is:

Q5. How many hats are here?

Your answer is:




Q6. How many pears are here?

Your answer is:

Q7. How many ice cream cones are here?

Your answer is:

Q8. How many basketballs are here?

Your answer is:

Q9. How many apples are here?

Your answer is:

Q10. How many coins are here?

Your answer is:






Q6. What is 9 + 9 using an addition table?

Your answer is:


Your answer is:


Your answer is:


Your answer is:


Your answer is:




Name:

Worksheet 4 Chapter 1.4 Addition Using Regrouping

Q1. What is 17 + 5 using regrouping?

Your answer is:


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Your answer is:


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Your answer is:


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Your answer is:





Your answer is:


Your answer is:


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Name:

Worksheet 5 Chapter 1.5 Find 10 More

Q1. What is 10 more than 4?

Your answer is:


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Your answer is:


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Your answer is:


Your answer is:


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Name:

Worksheet 6 Chapter 1.6 Commutative Property of Addition

Q1. Commutative Property of Addition says that?A. 3 + 4 = 4 + 3B. 2 + 5 = 5 + 2C. 4 + 5 = 5 + 4D. All of the above

Your answer is:

Q2. We know that 5 + 4 = 9. Would you get the same answer 9 if we switchthe 5 and 4 around?

A. YesB. No

Your answer is:

Q3. We know that 7 + 3 = 10. What is 3 + 7 = ?

Your answer is:


Your answer is:


Your answer is:

Q6. How can you rewrite 8 + 3 = 11 using the same numbers and get thesame answer?A. 3 + 11 = 14B. 11 + 3 = 14C. 3 + 8 = 11D. You cannot rewrite this and get the same answer.




Your answer is:

Q7. How can you rewrite 4 + 9 = 13 using the same numbers and get thesame answer?

A. 4 + 9 = 13B. 9 + 4 = 13C. 13 - 4 = 9D. You cannot rewrite this and get the same answer.

Your answer is:

Q8. How can you rewrite 9 + 6 = 15 using the same numbers and get the

same answer?A. 9 + 6 = 16B. 15 - 6 = 9C. 6 + 9 = 15D. You cannot rewrite this and get the same answer.

Your answer is:

Q9. Rewrite 9 + 1 = 10 using the same numbers and get the same answer.

Your answer is:

Q10. Rewrite 11 + 7 = 18 using the same numbers and get the same answer.

Your answer is:




Name:

Worksheet 7 Chapter 1.7 Associative Property of Addition

Q1. What is 2 + 3 + 4?

Your answer is:

Q2. What is 5 + 3 + 2?

Your answer is:

Q3. What is 4 + 3 + 6?

Your answer is:

Q4. What is 3 + 2 + 7?

Your answer is:

Q5. What is 6 + 4 + 5?

Your answer is:

Q6. You know that 3 + 5 + 4 = 12. What would you get if you add 5 + 4 firstand then add 3?

Your answer is:

Q7. You know that for the addition problem 2 + 8 + 3 = , you can add 2 + 8to get 10 and then add 10 + 3 to get 13. What would you get if you add 8+ 3 first and then add 2?

Your answer is:




Q8. You know that for the addition problem 6 + 3 + 5 = , you can add 6 + 3to get 9 and then add 9 + 5 to get 14. What would you get if you add 3 +5 first and then add 6?

Your answer is:

Q9. You know that for the addition problem 5 + 1 + 4 = 10. Add 5 + 1 = 6 and then add 6 + 4 = 10.What would you get if you add 1 + 4 first and then add 5?

Your answer is:

Q10. You know that for the addition problem 8 + 2 + 5 = 15. Add 8 + 2 = 10 and then add 10 + 5 = 15.What would you get if you add 2 + 5 first and then add 8?

Your answer is:




Name:

Worksheet 8 Chapter 1.8 Additive Identity Property of Addition

Q1. What is 0 + 0?

Your answer is:

Q2. What is 4 + 0?

Your answer is:

Q3. What is 9 + 0?

Your answer is:

Q4. What is 15 + 0?

Your answer is:

Q5. What is 19 + 0?

Your answer is:

Q6. What is 25 + 0?

Your answer is:

Q7. What is 39 + 0?Your answer is:

Q8. What is 44 + 0?




Your answer is:

Q9. What is 50 + 0?

Your answer is:

Q10. What is 56 + 0?

Your answer is:




Name:

Worksheet 9 Chapter 1.9 True or False

Q1. Is 3 + 8 = 8 + 3 true or false?

Your answer is:


Your answer is:


Your answer is:


Your answer is:


Your answer is:


Your answer is:

Q7. Is 6 + 6 = 7 + 5 true or false?Your answer is:





Your answer is:

Q9. Is 8 + 7 = 10 + 5 true or false?

Your answer is:

Q10. Is 8 + 4 = 4 + 8 true or false?

Your answer is:




Name:

Worksheet 10 Chapter 1.10 Find the Missing Number

Q1. What is the missing number below?

2 + 7 = 6 + ?

Your answer is:


5 + 6 = 3 + ?

Your answer is:


8 + 4 = ? + 6

Your answer is:


9 + 6 = ? + 11

Your answer is:


4 + 6 = 5 + ?

Your answer is:





8 + ? = 7 + 5

Your answer is:


9 + ? = 8 + 4 Your answer is:


? + 4 = 6 + 7

Your answer is:


14 + 5 = 18 + ? Your answer is:


15 + 5 = 10 + ? Your answer is:




Name:

Worksheet 11 Chapter 1.11 Addition with Carrying Numbers

Q1. What is 15 + 7? Solve by carrying numbers.

Your answer is:


Your answer is:


Your answer is:


Your answer is:


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Your answer is:


Your answer is:


Your answer is:


Your answer is:


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Name:

Worksheet 12 Chapter 1.12 Adding a 2 digit Number and a 1 digit Number

Q1. Add

15+ 8

Your answer is:

Q2. Add

17

+ 5

Your answer is:

Q3. Add

27+ 7

Your answer is:

Q4. Add

29+ 9

Your answer is:

Q5. Add

36+ 8

Your answer is:




Q6. Add

45

+ 9

Your answer is:

Q7. Add

49+ 6

Your answer is:

Q8. Add

51+ 9

Your answer is:

Q9. Add

58+ 3

Your answer is:

Q10. Add

65+ 4

Your answer is:




Name:


Q1. Add

25+ 18

Your answer is:

Q2. Add

29

+ 25

Your answer is:

Q3. Add

34+ 17

Your answer is:

Q4. Add

38+ 29

Your answer is:

Q5. Add

44+ 28

Your answer is:




Q6. Add

49

+ 39

Your answer is:

Q7. Add

50+ 46

Your answer is:

Q8. Add

54+ 47

Your answer is:

Q9. Add

58+ 53

Your answer is:

Q10. Add

64+ 57

Your answer is:




Name:


Q1. Add

199+ 56

Your answer is:

Q2. Add

267+ 76

Your answer is:

Q3. Add

436+ 69

Your answer is:

Q4. Add

396+ 89

Your answer is:

Q5. Add

446+ 64




Your answer is:

Q6. Add

408

+ 98

Your answer is:

Q7. Add

555+ 45

Your answer is:

Q8. Add

697+ 89

Your answer is:

Q9. Add

778+ 83

Your answer is:

Q10. Add

974+ 86

Your answer is:




Name:


Q1. Add

169+ 147

Your answer is:

Q2. Add

276+ 176

Your answer is:

Q3. Add

578+ 269

Your answer is:

Q4. Add

369+ 287

Your answer is:

Q5. Add

468+ 441




Your answer is:

Q6. Add

408

+ 598

Your answer is:

Q7. Add

665+ 365

Your answer is:

Q8. Add

668+ 289

Your answer is:

Q9. Add

578+ 433

Your answer is:

Q10. Add

947+ 486

Your answer is:




Name:

Worksheet 16 Chapter 1.16 Adding 3 Number Sets

Q1. Add

1419

+ 7

Your answer is:

Q2. Add

2729

+ 17

Your answer is:

Q3. Add

2225

+ 15

Your answer is:

Q4. Add

3727

+ 17

Your answer is:




Q5. Add

48

38+ 19

Your answer is:

Q6. Add

49

45+ 38

Your answer is:

Q7. Add

156265

+ 369

Your answer is:

Q8. Add

458269

+ 93

Your answer is:




Q9. Add

367

525+ 418

Your answer is:

Q10. Add

917621

+ 397

Your answer is:







Worksheets Answers Key







Worksheet 1 Chapter 1.1 Introduction to Addition

Q1. The correct answer is 15. Q2. The correct answer is 23.

Q3. The correct answer is 16. Q4. The correct answer is 16. Q5. The correct answer is 11. Q6. The correct answer is 14. Q7. The correct answer is 22. Q8. The correct answer is 20. Q9. The correct answer is 23. Q10. The correct answer is 17.

Worksheet 2 Chapter 1.2 Addition Using Objects



Worksheet 3 Chapter 1.3 Addition Using an Addition Table

Q1. The correct answer is 10. Q2. The correct answer is 11. Q3. The correct answer is 11. Q4. The correct answer is 17. Q5. The correct answer is 13. Q6. The correct answer is 18. Q7. The correct answer is 16. Q8. The correct answer is 16. Q9. The correct answer is 11. Q10. The correct answer is 20.




Worksheet 4 Chapter 1.4 Addition Using Regrouping



Worksheet 5 Chapter 1.5 Find 10 More

Q1. The correct answer is 14.Q2. The correct answer is 19.Q3. The correct answer is 26.Q4. The correct answer is 29.Q5. The correct answer is 38.Q6. The correct answer is 45.Q7. The correct answer is 49.Q8. The correct answer is 56.

Q9. The correct answer is 63.Q10. The correct answer is 77.

Worksheet 6 Chapter 1.6 Commutative Property of Addition

Q1. D. All of the aboveQ2. A. YesQ3. The correct answer is 10. Q4. The correct answer is 11. Q5. The correct answer is 14.

Q6. C. 3 + 8 = 11Q7. B. 9 + 4 = 13Q8. C. 6 + 9 = 15Q9. The correct answer is 1 + 9 = 10. Q10. The correct answer is 7 + 11 = 18.




Worksheet 7 Chapter 1.7 Associative Property of Addition


Q3. The correct answer is 13. Q4. The correct answer is 12. Q5. The correct answer is 15. Q6. The correct answer is 12.Q7. The correct answer is 13. Q8. The correct answer is 14. Q9. The correct answer is 10. Q10. The correct answer is 15.

Worksheet 8 Chapter 1.8 Additive Identity Property of Addition



Worksheet 9 Chapter 1.9 True or False

Q1. The correct answer is true. Q2. The correct answer is true. Q3. The correct answer is true. Q4. The correct answer is true. Q5. The correct answer is false.

Q6. The correct answer is false. Q7. The correct answer is true. Q8. The correct answer is true. Q9. The correct answer is true. Q10. The correct answer is true.




Worksheet 10 Chapter 1.10 Find the Missing Number



Worksheet 11 Chapter 1.11 Addition with Carrying Numbers

Q1. The correct answer is 22. Q2. The correct answer is 26. Q3. The correct answer is 43.Q4. The correct answer is 50. Q5. The correct answer is 51. Q6. The correct answer is 61. Q7. The correct answer is 73. Q8. The correct answer is 91.



Q1. The correct answer is 23. Q2. The correct answer is 22. Q3. The correct answer is 34. Q4. The correct answer is 38. Q5. The correct answer is 44. Q6. The correct answer is 54. Q7. The correct answer is 55. Q8. The correct answer is 60. Q9. The correct answer is 61. Q10. The correct answer is 69.






Worksheet 16 Chapter 1.16 Adding 3 Number Sets


Q3. The correct answer is 62. Q4. The correct answer is 81. Q5. The correct answer is 105. Q6. The correct answer is 132. Q7. The correct answer is 790. Q8. The correct answer is 820. Q9. The correct answer is 1,310. Q10. The correct answer is 1,935.






Documents

Early Elementary - Addition WorkText