Elementary Math

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Can you explain what the difference between rounding and front end estimation is? For example round 8267-2761= and front end estimate 6489-1807= .

  • Elementary Math -

    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).

    Now Rounding:
    8267-2761
    8300-2800
    5500

    You do the front end estimate.

  • Elementary Math -

    hello 99 77 86 88n 687 86 75 44 87 96 95 69 708 87980 79870

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