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Leading Digit Estimation
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leading digit estimation
Leading digit estimation of sum (also called front
end estimation) only uses the first digit of a number
when adding numbers. The other digits are replace
with zeros.
Example:
Example word problem:
Kennedy read 148 books last year. Tyler read 136
books. About how many books did they read all
together.
Find the sum using leading digit estimation.
Leading digit estimate
Exact number