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> Adding - Using Front End Estimation of Sums < you are here.
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Example:
Front-end estimation always gives a sum
less than the actual sum.
Add 5524 and 3452 using front end estimation of sum.
When finding the sum of several numbers, one
way to estimate the sum is  called
"front-end'
estimation.

In front end estimation of sum you add only the
first digit of the numbers. The other digits are
replace by zeros.
Video
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Adding-using Front End Estimation of Sum
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Front end addition
Normal addition
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