Rounding Numbers
Round the number to the largest place value:
765
800
Find the sum. Then, use rounding to check your work.
5,426 + 3,210 = ?
sum = 8,636
rounding: 5,000 + 3,000 = 8,000
Find the sum or difference. Then, use the opposite operation to check your work.
31 - 19 = ?
difference = 12
opposite operation: 12 + 19 = 31
Find the sum or difference. Then use rounding to check that your answers are reasonable. Round each number to its greatest place value.
196 + 389 = ?
Is it reasonable?
sum = 585
rounding: 200 + 400 = 600
YES
Round the number to the largest place value:
62,003
60,000
Find the difference. Then, use rounding to check your work.
8,475 - 3,356 = ?
difference = 5,119
rounding: 8,000 - 3,000 = 5,000
Find the sum or difference. Then, use the opposite operation to check your work.
23 + 64 = ?
sum = 87
opposite operation: 87 - 64 = 23
OR 87 - 23 = 64
Find the sum or difference. Then use rounding to check that your answers are reasonable. Round each number to its greatest place value.
786 - 453 = ?
difference = 333
rounding: 800 - 500 = 300
YES
Round the number to the largest place value:
58,430
60,000
Find the sum. Then, use rounding to check your work.
9,633 + 4,250 = ?
sum = 13,883
rounding: 10,000 + 4,000 = 14,000
Find the sum or difference. Then, use the opposite operation to check your work.
7,214 - 3,645 = ?
difference = 3,569
opposite operation: 3,569 + 3,645 = 7,214
Find the sum or difference. Then use rounding to check that your answers are reasonable. Round each number to its greatest place value.
196 + 389 = ?
sum = 585
rounding: 200 + 400 = 600
YES
Round the number to the largest place value:
956
1,000
Find the difference. Then, use rounding to check your work.
16,862 - 12,551 = ?
difference = 4,311
rounding: 20,000 - 10,000 = 10,000
Find the sum or difference. Then, use the opposite operation to check your work.
8,142 + 3,154 = ?
sum = 11,296
opposite operation: 11,296 - 3,154 = 8,142
OR 11,296 - 8,142 = 3,154
Find the sum or difference. Then use rounding to check that your answers are reasonable. Round each number to its greatest place value.
7,840 - 3,622 = ?
difference = 4,218
rounding: 8,000 - 4,000 = 4,000
YES
Round the number to the largest place value:
45,001
50,000
Find the sum. Then, use rounding to check your work.
6,572 + 8,144 = ?
sum = 14,716
rounding: 7,000 + 8,000 = 15,000
Find the sum or difference. Then, use the opposite operation to check your work.
707 - 183 = ?
difference = 524
opposite operation: 524 + 183 = 707
Find the sum or difference. Then use rounding to check that your answers are reasonable. Round each number to its greatest place value.
599 + 705 = ?
sum = 1,304
rounding: 600 + 700 = 1,300
YES