Question

Use rounding or compatible numbers to estimate the sum 52+39

Answer 1

The sum of 9 + 2 would be 11 and the sum of 50 + 30 would be 80. The total sum is 91.

- If you try to estimate, you first sum 50 + 30 and so you can estimate that the number will be somewhere close to 80.

- Now you can add the 9 form 39 to this number, and you can get even a more precise estimative saying the number will be approximately 89.

- Finally you add two to that number and you get the final correct answer.

Hope it helped,

BioTeacher101

Answer 2

Round to the nearest tens. 52 = 50 and 39 = 40

50 + 40 = 90 Simply add and that is the estimate of the sum 52 + 39