Subtracting Mentally
Make a 10 or 100 to subtract mentally.
77 - 69 =
78 - 70 =
8
Estimate. Round each number to the greatest place value.
78 - 42 =
80 - 40 =
40
Subtract to find the unknown.
772 - 135 =
637
Subtract to find the unknown.
4,590 - 1,905 =
2,685
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
Make a 10 or 100 to subtract mentally.
532 - 199 =
533 - 200
333
Subtract to find the unknown.
67 - 32 =
35
Estimate. Round each number to the greatest place value.
284 - 146 =
300 - 200 =
200
Subtract to find the unknown.
6,988 - 1,988
5000
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
Make a 10 or 100 to subtract mentally.
98 - 14 =
100 - 16 =
84
Estimate. Round each number to the indicated place value.
tens; 53 - 27 =
50 - 30 =
20
Subtract to find the unknown.
619 - 238 =
381
Subtract to find the unknown.
1,500 - 139 =
1,361
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
Make a 10 or 100 to subtract mentally.
502 - 367 =
500 - 365 =
135
Subtract to find the unknown.
82 - 39 =
Estimate. Round each number to the indicated place value.
hundreds; 389 - 252 =
400 - 300 =
100
Subtract to find the unknown.
1,000 - 753 =
247
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?
10
Make a 10 or 100 to subtract mentally.
984 - 203 =
981 - 200 =
781
Estimate. Round each number to the greatest place value.
92 - 12 =
90 - 10 =
80
Subtract to find the unknown.
914 - 829 =
85
Subtract to find the unknown.
7,000 - 1,286 =
5,714
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