Unit 2 Review

Fact Families

100

Write the fact family for the following 3 numbers: 

1, 2, 3

1 + 2 = 3

2 + 1 = 3

3 - 1 = 2

3 - 2 = 1

200

Write the following fact family for:

7, 8, 15

7 + 8 = 15

8 + 7 = 15

15 - 7 = 8

15 - 8 = 7

300

Write the fact family for the following numbers:

25, 50, 75

25 + 50 = 75

50 + 25 = 75

75 - 25 = 50

75 - 50 = 25

400

Write the fact family for the following three numbers:

25, 100, 125

25 + 100 = 125

100 + 25 = 125

125 - 25 = 100

125 - 100 = 25

500

Write the fact family for the following numbers:

250, 500, 750

250 + 500 = 750

500 + 250 = 750

750 - 250 = 500

750 - 500 = 250 

Subtraction

100

Subtract. 

67 - 32

35

200

Subtract. 

776 - 223

553

300

Subtract. 

251 - 179

72

400

Subtract.

4905 - 1896

3009

500

Subtract. 

6002 - 3995

2007

Rounding

100

Estimate using rounding. Round to the highest place value.

49 - 25

20

200

Estimate using rounding. Round to the highest place value. 

195 - 105

100

300

Estimate using quarter rounding. Round to the highest place value. 

95 - 26

75

400

Estimate using quarter rounding. 

455 - 127

325

500

Estimate using quarter rounding. 

4027 - 1995

2025

Find the Error

100

This problem may contain an error. Determine if it is true or false. 

42 - 27 = 15

True

200

Determine if the problem is true or false. 

464 - 93 = 431

False. Answer is 371

300

Determine if the answer is true or false. 

819 - 427 = 392

True. 

400

Determine if the answer is true or false.

982 - 376 = 506

False. Answer is 606

500

Determine if the answer is true or false. 

1839 - 890 = 949

True. 

Using a Calculator

100

Use a calculator to solve the following problem:

4829 - 203 =

4626

200

Use a calculator to solve the problem:

2749 - 293 = 

2456

300

Use a calculator to solve the problem:

7942 - 139 = 

7803

400

Use a calculator to solve the problem: 

2792 - 274 = 

2518

500

Use a calculator to solve the problem:

6738 - 2855 =

3883