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 Home--maths--Third Grade--Front End Estimation of Sums

Front End Estimation of Sums

Estimating by Front End Estimation

Front end estimation mostly produces a closer estimate of sums or differences than the answer produced by adding or subtracting rounded numbers.

How to estimate a sum by front end estimation:

  • Add the digits of the two highest place values
  • Insert zeros for the other place values

  • Example 1: 4496 + 3745 is estimated to be 8100 by front end estimation (i.e. 4400 + 3700).
  • Example 2: 4496 + 745 is estimated to be 5100 by front end estimation (i.e. 4400 + 700).

Estimate the sum by front end estimation.

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2006-10-04 13:32:06
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