Learning Objective Name________________________

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2nd Grade Math Number Sense 2.2 (4Q)Find the sum or difference of two whole numbers up to three digits long.

Lesson to be used by EDI-trained teachers only.

Learning Objective Name________________________

Today, we will add numbers.

CFUWhat are we going to do today?What are we going to add?

Activate (or Provide) Prior Knowledge

CFUTeacher solves #1; students solve #2. Students, you already know add facts. Today, we will use add facts to add larger numbers.

Today, we are going to add numbers.We are going to add numbers.

5

+ 4

2

+ 6

1. 2.

9 8




CFU

Using your whiteboards, write the symbol that means add. Which problem is an add problem, A or B? Explain your answer.

A.

B.

Concept Development

Add (+) means to put together. • The symbol1 (), is called the plus sign. We use it when we have to add.

• After we add, the answer is called the sum.1 letter, picture or sign that stands for something else

7 8 2

+ 2 1 5

5 6

- 3 1

Example:

Write the sum of the two numbers. The sum of 42 and 53 is _____.In your own words, what does add mean? Add means ____________________.

Noah won 42 tickets at the arcade. Yvonne won 53 tickets. How many tickets did they win altogether?

Noah and Yvonne won 95 tickets.4 2

+ 5 3

9 5

95




1. 2. 3.

4. 5. 6.

CFUHow did I add digits in the ones column? How did I add digits in the tens column? How did I add the digits in the hundreds column? How did you add digits in the ones column? How did you add the digits in the tens column? How did you add the digits in the hundreds column?

Skill Development/Guided Practice

Step #1: Add the digits in the ones column.Step #2: Add the digits in the tens column.Step #3: Add the digits in the hundreds column, if needed. Step #4: Read the problem and the sum.

Add () means to put together.• After we add, the answer is called the sum.

Add numbers.

7 4 + 1 3

0 08 7

8

4

8

7 078 079

7 0 + 1 0




7. 8.

9. Mr. Salazar’s class had a 15 minute recess. As a reward for good behavior, he gave them 10 more minutes of recess. How many minutes of recess did his class get?

10. In Mrs. Meza’s class there are 14 boys and 13 girls. How many students are there altogether?

1 4+ 1 3

Skill Development/Guided Practice (continued)

Add () means to put together. • After we add, the answer is called the sum.

CFU How did I add digits in the ones column? How did I add digits in the tens column? How did I add the digits in the hundreds column? How did you add digits in the ones column? How did you add the digits in the tens column? How did you add the digits in the hundreds column?

1 5+ 1 0

885 794

52 72minutes students


Add numbers.






Importance

CFUDoes anyone else have another reason why it is important to add numbers? (pair-share) Why is it important to add numbers? You may give me one of my reasons or one of your own. Which reason means the most to you? Why?


1. Adding numbers will help you add larger numbers.

David wants a gaming console that costs $220 and a bike that costs $249. How much will these cost altogether?

3. Adding numbers will help you do well on tests There are no CST questions released for adding numbers without regrouping.

2 make decisions about something

2,431+ 6,214 8,645

2. Adding numbers will help you manage2 money.




Closure

1. In your own words, what does add mean?2. Add the numbers below. 3. What did you learn today about adding numbers? Why is that important to you? (pair-share)

Step #1: Add the digits in the ones column.

Step #2: Add the digits in the tens column.

Step #3: Add the digits in the hundreds column, if needed.

Step #4: Read the problem and the sum.

1. 2.

3. Jason bought a cookie for 50¢ and juice for 45¢.

How much money did he spend?

99

59 cents

786




1. 2. 3.

4. 5. 6.

Independent Practice

Name _____________________________

03 05 95

47 095 047



Add numbers.




Independent Practice (continued)

Name _____________________________Add () means to put together. • After we add, the answer is called the sum.

7. 8.

9. Gary’s grandpa gave him $40 for his birthday. His Aunt Sharon gave him $35. How much birthday money did Gary get?

10. Veronica spent 18 minutes on her math homework and 30 minutes on her language arts homework. How much time did she spend on homework?

1 5 6 + 7 4 3

1 4 7 + 8 5 2

1 8 + 3 0

998 999

84

$ 4 0 + $ 3 5

57$ minutes


Add numbers.




Periodic Review 1

Name _____________________________Add () means to put together.• After we add, the answer is called the sum.

1. 2. 3.

4. 5. 6.

4 0 + 3 0

4 0 + 2 0

1 7 + 5 2

3 4 + 6 2

1 7 0 + 5 2 0

3 4 0 + 6 2 0

07 06 96

69 096 069


Add numbers.




7. 8.

9. Adam read 12 chapter books last summer.This summer, he read 16 chapter books. How many books did he read altogether?

10. Sarah bought a pair of shoes for $24 and a watch for $15. How much did she spend?

5 7 6 + 4 1 2

889 779

82 93

Periodic Review 1 (continued)



Add numbers.

8 2 4 + 1 5 3

1 2 + 1 6

2 4 + 1 5




1. 2. 3.

4. 5. 6.

1 0 + 6 0

2 0 + 7 0

1 9 + 4 0

1 8 + 6 1

1 9 0 + 4 0 0

1 8 0 + 6 1 0

07 09 95

97 095 097

Periodic Review 2



Add numbers.




7. 8.

9. Daniel spends 30 minutes reading on Sunday and 48 minutes reading on Tuesday.

How many minutes did he read on both days?

10. Cindy practiced her math facts for 21 minutes on Monday and 34 minutes on Tuesday. How many minutes did she practice her math facts?

5 1 2 + 2 8 3

4 5 2 + 2 1 3

3 0 + 4 8

2 1 + 3 4

566 597

87 55minutes minutes




Add numbers.




1. 2. 3.

4. 5. 6.

3 0 + 6 0

09

4 3 + 2 6

7 9 + 1 0

4 3 0 + 2 6 0

7 9 0 + 1 0 0

3 0 + 5 0

9608

98 096 098

Periodic Review 3



Add numbers.




7. 8.

9. Melinda washed dishes for 32 minutes. She vacuumed for 26 minutes. How much time did she spend washing dishes and vacuuming?

10. Daryl bought a baseball cap for $25. He also bought socks for $13. How much did he spend all together?

5 0 4 + 3 9 2

5 6 5 + 3 0 4

3 2 + 2 6

$ 2 5 + $ 1 3

968 698

85 83minutes $




Add numbers.

Documents

Learning Objective Name________________________