Question

Estimate 15.89+5.557 by first rounding each number to the nearest tenth

Answer 1

Answer: 21.5

Step-by-step explanation:

Rounding 15.89: Find the number in the tenth place  8  and look one place to the right for the rounding digit  9 . Round up if this number is greater than or equal to  5  and round down if it is less than  5 . = 15.9

Rounding 5.557: Find the number in the tenth place  5  and look one place to the right for the rounding digit  5 . Round up if this number is greater than or equal to  5  and round down if it is less than  5 .  = 5.6

Sum up 15.9+5.6 and get 21.5

Answer 2

Round each number up or down ( 15.89 to 15.9 and 5.557 to 5.6) and the add. the rounded answer would be 21.5.