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).

Estimate the Difference by front end estimation.

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