Study the example showing how to subtract tens. Then solve ...
Transcript of Study the example showing how to subtract tens. Then solve ...
©Curriculum Associates, LLC Copying is not permitted. 83Lesson 8 Subtract Two-Digit Numbers
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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:
©Curriculum Associates, LLC Copying is not permitted. 85Lesson 8 Subtract Two-Digit Numbers
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
©Curriculum Associates, LLC Copying is not permitted.86 Lesson 8 Subtract Two-Digit Numbers
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
©Curriculum Associates, LLC Copying is not permitted. 87Lesson 8 Subtract Two-Digit Numbers
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
©Curriculum Associates, LLC Copying is not permitted.88 Lesson 8 Subtract Two-Digit Numbers
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
©Curriculum Associates, LLC Copying is not permitted. 89Lesson 8 Subtract Two-Digit Numbers
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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
©Curriculum Associates, LLC Copying is not permitted.90 Lesson 8 Subtract Two-Digit Numbers
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?