Addition and Subtraction Strategies

Rounding

100

Round the number to the nearest thousand 

5,645

6,000

200

Round each number to its greatest place value and estimate the sum 

687 + 321 = 

700 + 300 =1,000

300

Round each number to the greatest place value and estimate the difference 

1,519 - 954 =

2,000 -1,000 = 1,000

400

Round each number to its greatest place value and estimate the sum 

6,187 + 3, 675 =

6,000 + 4,000 =10,000

500

Round each number to the greatest place value and estimate the difference 

2,764 - 365 =

3,000 - 400 = 2,600

Place Value and Expanded Form

100

What is the place value represented in the hundreds place 

6,540

500

200

 If 3,546 - 1,983 is about 1,500 

What is the place value they rounded the number to? 

Nearest ten?    Nearest hundred?   Nearest thousand?

Nearest hundred 

300

If 3,228 + 4,263 is about 7,000 

What is the place value each number is rounded to? 

Nearest ten?    Nearest hundred?  Nearest thousand?

Nearest thousand 

400

Show 4,578 in expanded form 

4,000 + 500 + 70 + 8 

500

Show 32,876 in expanded form 

30,000 + 2,000 + 800 + 70 +6

Addition Strategies

100

What strategy did they use to solve this problem? 

43 + 56 

43 + 50 = 93 

93 +6 =99 

Decompose by Place Value 

200

Use Compensation to solve this problem 

47 + 54 = 

(47+3) + (54-3) = (50+51) =101

300

Use Decompose to Make A Landmark to solve this problem 

588+342 =

588+22= 600 

600+320=920

400

Use Adjust a Helper Problem to solve this number sentence 

39 + 58 = 

39+1 = 40 

40 + 58 = 98 

98 -1 = 97 

39 + 58 = 97

500

Name all 4 addition strategies (not including stacking) 

Compensation

Adjust a Helper Problem

Decompose to Make A Landmark 

Decompose by Place Value 

Subtraction Strategies

100

Use Decompose by Place Value to solve this problem 

62-24 =

62-24 =? 

62-20 =42 

42-4=38

62-24=38

200

Use Add Up strategy to solve the problem 

(You must show your work using a number line) 

43-39 = 

43-39 =? 

39 + ? = 43

39 + 4 =43

43-39 = 4

300

Use Decompose to Make a Landmark to solve the subtraction number sentence 

700-213 =?

700 - 213 =?

700-200 =500 

500-13=487 

400

Name all 4 Subtraction Strategies (not including stacking)

Add Up 

Decompose to Make a Landmark

Decompose by Place Value 

Adjust a Helper Problem

500

Use Adjust a Helper Problem to solve the subtraction number sentence 

48-19 =

48 - (19+1)=

48-20=28 

28+1 =29

Choose the Strategy

100

Which strategy would be best to solve this problem? 

Solve the problem using the correct strategy

33 + 46 = ? 

Compensation 

(33-3) + (46 +3) = 30+49 = 79

200

Choose the strategy that would be most efficient in solving 

Then solve the problem using the strategy 

63 - 56 = 

Add up 

56 + ? = 63 

56 + 7 =63 

63-56 = 7  

300

Choose the strategy that would be most efficient in solving 

67 + 32 = 

Decompose by Place Value  or Decompose to Make a Landmark 

400

What is the most efficient strategy to solve 

31 - 23 = 

Adjust a Helper Problem 

31-1 = 30

30-23 =17 

17+1=18 

500

Choose the most efficient strategy to solve 

3,450 + 2,862 = 

Decompose by Place Value 

3,000 + 2,000 =5,000

400 +800= 1,200

50+60 =110

2

5,000 + 1,200 +110 +2 =6,312