study the example showing how to subtract tens. then solve

©Curriculum Associates, LLC Copying is not permitted. 83Lesson 8 Subtract Two-Digit Numbers

Name:

Lesson 8

Subtract Two-Digit Numbers

Subtract Tens

Study the example showing how to subtract tens. Then solve Problems 1–5.

John has 60 white and red balloons There are 40 white balloons

1 Fill in the blanks

40 1 ? 5

4 tens 1 tens 5 tens

40 1 5 60

60 2 40 5

2 How many balloons are red?

Example

50 2 20 5 ? is the same as 20 1 ? 5 50

Write as tens 2 tens 1 ? tens 5 5 tens 2 tens 1 3 tens 5 5 tens 20 1 30 5 50

50 2 20 5 30

2 tens 3 tens

4 tens 2 tens

©Curriculum Associates, LLC Copying is not permitted.84 Lesson 8 Subtract Two-Digit Numbers

Solve.

3 Mr Lin has 80 rubber bands He puts 30 of the rubber bands in a drawer The rest are on the table How many rubber bands are on the table?

Show your work.

Answer: There are rubber bands on the table

4 Jada has 70 pens She gives away 50 pens How many pens are left?

Show your work.

Answer:

5 Marco and Jess fold 60 napkins altogether Jess folds 20 more napkins than Marco How many napkins do they each fold?

Show your work.

Answer:


Name: Lesson 8

Subtract Two-Digit Numbers by Adding Up

Study the example that shows how to subtract two-digit numbers by adding up. Then solve Problems 1–6.

Mr Kent needs 74 plates for a picnic He has 28 plates He will buy the rest of the plates he needs

1 Show how you can find how many plates Mr Kent needs to buy Fill in the blanks to find 74 2 28 Add tens first

28 1 5 68

68 1 5 70

70 1 5 74

40 1 1 5

2 How many plates should Mr Kent buy?

plates

Example

A store has 82 hats There are 45 blue hats The rest are red How many hats are red?

82 2 45 5 ? is the same as 45 1 ? 5 82

You can add tens first Then add ones

45 1 30 5 75 75 1 5 5 80 80 1 2 5 82

30 1 5 1 2 5 37 There are 37 red hats in the store

45 75 80 82

530 2

240 4

28 68 70 74


Solve.

Ms Jones has 54 pencils She gives 17 of the pencils to her students

3 Show how you can add ones first to find 54 2 17 Fill in the blanks on the number line

4 How many pencils does Ms Jones have left?

Show your work.

pencils

There are 65 trees in the town park 38 are apple trees The rest are oak trees

5 How many oak trees are there? Add up to find 65 2 38

Show your work.

Answer:

6 To solve Problem 5, did you add tens or ones first? Explain why

17

30

20 54


Name: Lesson 8

Subtract Two-Digit Numbers by Regrouping

Study the example showing how to subtract two-digit numbers by regrouping a ten. Then solve Problems 1–6.

Kate paints 44 stars She paints 27 of the stars silver She paints the rest gold

1 Regroup a ten in 44 Fill in the blank

44 5 3 tens and ones

2 How many stars are gold? Find 44 2 27

Show your work.

Answer: stars are gold

Example

What is 33 2 18? You can regroup a ten first Then subtract

33 5 2 tens and 13 ones

2 tens and 13 ones 2 1 ten and 8 ones 1 ten and 5 ones 5 15

33 2 18 5 15


Solve.

3 Subtract tens first to solve 51 2 22 Fill in the blanks

51 2 5 31 31 2 5

4 Wyatt solved 57 2 38 He subtracted tens first Fill in the blanks to show the next step and the answer

5 There are 32 boys and girls on the playground There are 19 girls How many boys are on the playground?

Show your work.

Answer:

6 This is how Dora subtracts 73 2 26 Fill in the blanks to finish the problem

73 2 3 5

70 2 5 50

2 5

57 2 30

27

2


Name:

3 Circle Yes or No to tell if you can use the number sentences to find 43 2 26

a 26 1 4 5 30 and 30 1 13 5 43 Yes No

b 26 1 10 5 36 and 36 1 3 5 39 Yes No

c 43 2 10 5 33 and 33 2 6 5 27 Yes No

d 43 2 20 5 23 and 23 2 6 5 17 Yes No

Subtract Two-Digit Numbers

Solve the problems.

2 Show another way to find 54 2 15 Make sure it is different than what you did in Problem 1

1 There are 54 children in a parade 15 hold flags The rest play instruments How many children play instruments? Find 54 2 15

Show your work.

Answer:

How many tens and ones are in 26?

You can regroup a ten first. You can also subtract tens first.

I can add up to subtract. Which number do I start with?

Lesson 8


Solve.

4 There are 86 cars in the parking lot Then 37 cars drive away How many cars are in the parking lot now? Find 86 2 37 Circle the correct answer

A 59 C 49

B 58 D 48

Lin chose A This is wrong How did Lin get her answer?

5 How can you find 72 2 25? Circle all the correct answers

A 72 2 30 5 42 and 42 2 5 5 37

B 25 1 5 5 30 and 30 1 40 5 70 and 70 1 2 5 72

C

240 5

25 65 70 72

D 6 tens 12 ones 2 2 tens 5 ones

What methods do you know for subtracting two-digit numbers?

How can you write 86 so that you have 16 ones?

study the example showing how to subtract tens. then solve

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