Question

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

Answer 1

-10

Explanation:

When you are estimating, you round.

You can round -7.94 to -8

You can round -2.31 to -2

So you have now rounded the problem to:

-8-2

The answer would be -10.

So, -10 would be a good estimate for that problem.

You can check your answer by doing the actual problem.

-7.94 - 2.31

That equals -10.25

-10.25 rounds down to -10, so, yes, -10 would be a good estimate.