Rounding & Estimation

**> Estimating Sum < **

**Estimating Sum**

To estimate a sum, first round the numbers. Then

add. When estimating a sum first decide what

rounding will take place.

Example word problem: At the book store, the teacher

bought 279 storybooks and 167 coloring books.

About how many books did he buy in all?

**Round to the nearest ten.**

**You can estimate numbers to the nearest ten, hundreds, thousands, ten-thousands, etc.**