Question

Ed has a box with 147 building blocks in it, but he has to throw out 28 broken ones. His cousin gives him 2 packs of 48 blocks as a present, and Ed adds them to the box. He estimates that he now has about 300 building blocks. Is that a good estimate?

Answer 1

Let's calculate the total number of blocks Ed has after throwing out the broken ones and adding the two packs of blocks:

Initial number of blocks: 147

Broken blocks: -28

Blocks from cousin: +2 x 48 = 96

Total blocks: 147 - 28 + 96 = 215

So Ed actually has 215 blocks, which is quite a bit less than his estimate of 300. Therefore, his estimate is not very good.