Question

Which of the following uses estimation to check 267 – 154 = 113? 

A. 300 – 200 = 100   B. 300 – 150 = 150   C. 113 + 154 = 267   D. 270 – 150 = 120

Answer 1

Estimation is taking the general values of an equation to find an answer that is close to the actual answer.

Round the numbers in the equation to their tens places by checking their ones value:

267
7 > 5
267 -> 270

154
4 < 5
154 -> 150

Subtract these two rounded values:


`270 - 150 = 120`

The answer that has this equation is D.