Round each number to the nearest ten to estimate. 22.6 + 63.1

22.6 + 63.1 = 87.5, but since u said round to nearest ten, the answer is 90.

If u round ALL numbers, if u round 22.6 u will get 20, round 63.1 and u get 60, add those 2 together and u get 80, u don't round 80, its rounded enough in tens.