Question

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

A. -9
B. -5
C. -6
D. -10

Answer 1

-10

Explanation:

Answer 2

A good estimate would be -10.

In order to estimate, start off by rounding both numbers to the nearest whole number. -7.94 can be rounded to -8 because the first number to the right of 7 is greater than 5. 2.31 can be rounded to 2 because the first number to the right of the 2 is less than 5.

After rounding, the expression becomes -8-2, which is equal to -10.