Question

Use rounding to estimate the product 12*9. Then, use compensation to find the actual answer. If Alison was rounding to find how much 12 books that were $9 apiece cost, would she get a good estimate? Explain.

Answer 1

I would do 12 x 10 = 120
to compensate do 120 - 12 =108 same as 12*9 = 108

The estimate is decent, because we are only $12.00 from the real answer.