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Using Front-End Estimation of Sums

When finding the sum of several numbers, one
way to estimate the sum is called
"front-end'
estimation.
(1) First add the 'front-end' digits ( the numbers prior to
the decimal point).

(2) Round off & estimate the sum of any decimal values.

(3) Combine both sums.
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> Adding Decimals - Using Front End Estimation of
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Adding Decimals Numbers
Examples:
12.4 + 7 + 3.02 =?
73.4 + 6.67 =?
Example:   Add 4.41 + 1.69 + 5.79 =
adding decimal front end stimation of sum