Module 4Lesson 9 and 10

Objective Use math drawings to represent the composition when adding a two-digit to a three-digit addend.

Application Problem Marla spilled a box of paper clips.

They landed on her desk and onto the floor. 20 of them landed on her desk, and 5 more fell on the floor than landed on her desk. How many paper clips did she spill?

Fluency Practice Say the number in standard form.

Ready? 352 Say the number in expanded form.

Ready? 300 + 50 + 2 Say the number Say Ten way 3 hundreds, 5 tens, 2 ones What is 20 more than 352? 37220 less?

100 more?

100 less?102 less? 220 less? 510 more?

Fluency Practice Let’s use a mental math strategy to subtract.

52 – 39 = ____ How much more does 39 need to make the

next ten? 1 more. Add 1 to each number and give me the new

number sentence. 53 – 40 = solve 53 – 40 =13 37-19 38 - 20 = 18

Sprints• Sprint A• On your mark, get set, THINK

• Sprint B• On your mark, get set, THINK

Concept Development Write 34 + 18 the vertical way on your

paper. Now draw a model using a place value

chart like this one. Label the tens and ones.

Now draw a model of each addend. Start with the top number.

Now the bottom addend Check your model 10’s 1’s

3 4+ 1 8

Concept Development What is 4 ones + 8 ones? 12 ones! Did you notice anything

about your ones? Bundle! Circle ten ones as one 10 Write a 1 on the line below the tens

place, and write 2 under the line below the ones place.

Now we add the tens. So 34 + 18 equals 52. 10’s 1’s

3 4+ 1 8

Concept Development Write 134 + 18 the vertical way on your paper What is 4 ones + 8 ones? 12 ones! Did you notice anything about your

ones? Bundle! Circle ten ones as one 10 Write a 1 on the line below the tens place, and

write 2 under the line below the ones place. Now we add the tens. Now add the hundreds So 134 + 18 equals 152.

100’s

10’s 1’s

1 3 4 + 1 8

Concept Development Now you practice. 114 + 37 158 + 26 163+ 29 48 + 147 While you practice I will walk around

to see how you are using the strategies that we are working on.

Application Problem Moses sold 24 raffle tickets on

Monday and 4 fewer on Tuesday. How many tickets did he sell in all on both days?

Concept Development Copy the following problem on your

paper in vertical form. Use place value language to prove to your partner that you have lined the numbers up correctly.

26 + 147100’s 10’s 1’s

When you’re finished, check your work with a partner, and explain how your model matches the written addition. Use place value language to explain each step used.

Check Your Work 26 + 147 can be written with any

number on the top but, it is easier and less confusing to write the bigger number on the top.

100’s 10’s 1’s 1 4 7+ 2 6

3

1

37

7

1

1

Your Turn! Solve these problems: 35 + 106 81 + 109 117 + 48 23 + 159