Question

Which of the following would be a good estimate for -7.94 - 2.31?

-10
-5
-9
-6

Answer 1

-10.

Explanation:

-7.94 can be estimated as -7.9, and -2.31 as -2.3.

Hence, the end result is -7.9 - 2.3 = -10.2.

Therefore, -10 is a good estimate.

Hope this helped!