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Estimating Sum
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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.
Example-2: There were 68 people at the dance on
friday and 153 people on Saturday. About how
many people were at the dance in all.
Round to the nearest ten.
Example: 276 + 593 + 734 to the nearest hundreds.
Estimate to the nearest hundreds.
236 rounds to 200

593 rounds to 600

734 rounds to 600
about  1,400
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You  can estimate numbers to the nearest ten, hundreds,
thousands, ten-thousands, etc.