Provide an appropriate response.A student wanted to estimate 21.5 × 0.0079 by first rounding each number. He solved the problem as follows:21.5 × 0.0079 is approximately equal to 20 × 0.008, which is equal to 0.016. So he estimated the answer as 0.016. Do you agree with the answer? If not, explain where the student went wrong and give the correct answer.

Question

What will be an ideal response?

Answer 1

The student rounded correctly, but he did not multiply correctly.
20 × 0.008 ? 0.016
20 × 0.008 = 0.16. (Explanations will vary.)