Adding and Subtracting by Rounding

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

7.114 + 6.122

The sum is approximately

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

3.78 + 7.249

The sum is approximately

Lucy packaged 346 cookies in March and 589 cookies in April. Which estimate below uses rounding to the nearest 10 to find how many more cookies she sold in April than in March?

• 600 - 300 = 300

• 590 - 350 = 240

• 580 - 350 = 230

• 590 + 340 = 930

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

10.477 − 3.316

The difference is approximately

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

10.17 + 5.13 + 2.6

The sum is approximately

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

10.323 − 1.369

The difference is approximately

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

7.4 − 3.7

The difference is approximately

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

5.104 − 1.972

The difference is approximately