Rounding & Estimation

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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.

estimate sum

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