Estimate Sums and Differences Up to 100

Use compatible numbers to estimate the value of 76 + 26.

• 75 + 25 = 100.

• 80 + 30 = 110

• 76 + 26 = 102

• 70 + 20 = 90

Estimate to the tens place.
37 + 42 + 43 =

• 100

• 110

• 120

• 122

Estimate the sum of 52+59 by rounding to the nearest tens

• 110

• 100

• 111

• 90

Estimate the sum of 37+99 by rounding to the nearest tens

• 120

• 150

• 140

• 136

Estimate the difference by rounding to the nearest hundred.

839 - 576

Estimate the difference by rounding to the nearest hundred.

671 - 357

Estimate the sum by rounding to the nearest hundred

416 + 253

Estimate the sum by rounding each number to the nearest whole number and then adding.

6.17 + 4.7

The sum is approximately

Estimate the sum by rounding each number to the nearest whole number and then adding.

8.598 + 2.78

The sum is approximately

Estimate the difference by rounding each number to the nearest whole number and then subtracting.

10.477 − 3.316

The difference is approximately