Subtracting Mentally
Subtraction- tens
Subtraction- hundreds
Subtraction- THOUSANDS
MEGA CHALLENGE
100

Make a 10 or 100 to subtract mentally.

77 - 69 =

78 - 70 = 

8

100

Estimate. Round each number to the greatest place value.

78 - 42 =

80 - 40 =

40

100

Subtract to find the unknown.

772 - 135 =

637

100

Subtract to find the unknown.

4,590 - 1,905 =

2,685

100

Determine whether an ESTIMATE or an EXACT ANSWER is required. Then solve.

Andrew rode a train for 66 miles, and Ray rode a train for 32 miles. About how many more miles did Andrew ride than Ray?

70 - 30 =

40

200

Make a 10 or 100 to subtract mentally.

532 - 199 =

533 - 200

333

200

Subtract to find the unknown.

67 - 32 =

35

200

Estimate. Round each number to the greatest place value.

284 - 146 = 

300 - 200 =

200

200

Subtract to find the unknown.

6,988 - 1,988

5000

200

Determine whether an ESTIMATE or an EXACT ANSWER is required. Then solve.

Miss Rascio picked 834 blueberries and ate 193 of them. How many are left?

641

300

Make a 10 or 100 to subtract mentally.

98 - 14 = 

100 - 16 = 

84

300

Estimate. Round each number to the indicated place value.

tens; 53 - 27 =

50 - 30 =

20

300

Subtract to find the unknown.

619 - 238 =

381

300

Subtract to find the unknown.

1,500 - 139 =

1,361

300

Determine whether an ESTIMATE or an EXACT ANSWER is required. Then solve.

Brelyn decided to go to the beach. She found 92 shells, but her mom only let her keep 14. About how many shells did Brelyn have to leave at the beach?

90 - 10 = 

80

400

Make a 10 or 100 to subtract mentally.

502 - 367 = 

500 - 365 = 

135

400

Subtract to find the unknown.

82 - 39 =

43
400

Estimate. Round each number to the indicated place value.

hundreds; 389 - 252 =

400 - 300 =

100

400

Subtract to find the unknown.

1,000 - 753 =

247

400

Determine whether an ESTIMATE or an EXACT ANSWER is required. Then solve.

DJ counted 89 cars on his way to school. He counted 75 cars on the way home. To the nearest ten, about how many more cars did he count on his way to school? 

90 - 80 = 

10

500

Make a 10 or 100 to subtract mentally.

984 - 203 = 

981 - 200 = 

781

500

Estimate. Round each number to the greatest place value.

92 - 12 = 

90 - 10 =

80

500

Subtract to find the unknown.

914 - 829 = 

85

500

Subtract to find the unknown.

7,000 - 1,286 =

5,714

500

Determine whether an ESTIMATE or an EXACT ANSWER is required. Then solve.

Evan was building legos in his room. He built two towers. Tower A had 1,098 lego blocks and tower B had 735 lego blocks. How many more blocks did tower A have than tower B?

363