Subtraction Review

Make a 10

100

Make a 10 to subtract mentally.

94 - 59

59 --> 60 (+1)

94 - 60 = 34

34 (+1) =35

So, 94-59 = 35

200

Make a 10 to subtract mentally.

86 - 49

49 --> 50 (+1)

86 - 50 = 36

36 (+1) = 37

So, 86 - 49 = 37

300

Make a 10 to subtract mentally.

67 - 29

29 --> 30 (+1)

67 - 30 = 37

37 (+1) = 38

So, 67 - 29 = 38

400

Make a 100 to subtract mentally.

223 - 99

99 --> 100 (+1)

223 - 100 = 123

123 (+1) = 124

So, 223 - 99 = 124

500

Make a 100 to subtract mentally.

356 - 298

298 --> 300 (+2)

356 - 300 = 56

56 (+2) = 58

So, 356 - 298 = 58

Estimate

100

Estimate. Round each number to the nearest ten.

86 - 64

86 --> 90

64 --> 60

90 - 60 = 30

200

Estimate. Round each number to the nearest ten.

550 - 244

550

244 --> 240

550 - 240 = 310

300

Estimate. Round each number to the nearest ten.

34 - 7

34 --> 30

7 --> 10

30 - 10 = 20

400

Estimate. Round each number to the greatest place value.

388 - 311

388 --> 400

311 --> 300

400 - 300 = 100

500

Estimate. Round each number to the nearest hundred.

$3,257 - $189

$3,257 --> $3,300

$189 --> $200

$3,300 - $200 = $3,100

Find the Unknown

100

Subtract to find the unknown.

86 - 17

69

200

Subtract to find the unknown.

795 - 775

20

300

Subtract to find the unknown.

857 - 427

430

400

Subtract to find the unknown.

$458 - $223

$235

500

Subtract to find the unknown.

3,012 - 1,225

1,787

Subtract Across Zeros

100

Subtract across zeros to find the unknown.

100 - 55

45

200

Subtract across zeros to find the unknown.

300 - 134

166

300

Subtract across zeros to find the unknown.

2,006 - 536

1,470

400

Subtract across zeros to find the unknown.

1,007 - 972

35

500

Subtract across zeros to find the unknown.

$9,006 - $7,474

$1,532

Random

100

Finish the rule:

When you subtract 0 from a number, you get ____?

that number.

200

Finish the rule:

When you subtract a number from itself, you get ____.

zero

300

Mentally subtract 34 - 18 by breaking apart the smaller number.

18 = 14 + 4

34 - 14 = 20

20 - 4 = 16

34 - 18 = 16

400

The local zoo has 124 mammals and 97 reptiles. How many more mammals does the zoo have than reptiles?

124 - 97 = 27 mammals

500

Determine rather an estimate or exact answer is required. Then solve.

In the third grade, there are 132 girls and 149 boys. How many more boys than girls are in the third grade?

Exact; 149 - 132 = 17 boys