Question

Estimate the product of 25.311 × 4.65.

Answer 1

The answer would be:

117.69615

BUT since it's asking you to estimate, I would put:

"about 117.69"

Answer 2

The best way is to round off the two multiplicands, not to round off the "exact" answer.

Round off 25.311 to 25 and round off 4.65 to 5.  Then the approx. product is 125.