Rounding & Estimation

> Leading Digit Estimation <

 

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:

leading digit estimation
 

Example word problem:

Kennedy read 148 books last year. Tyler read 136
books. About how many books did they read all
together.

fing the sum using leading digit estimation