Front End Estimation

Estimating by front end estimation

Front end estimation generally produces a better estimate of sums or differences than rounding before adding or subtracting.
How to estimate a difference by front end estimation:

Subtract the digits of the two highest place values

Insert zeros for the other place values

Example: 7396 minus 3745 is estimated to be 3600 by front end estimation (i.e. 7300-3700).

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Estimate the Difference by front end estimation.