Adding Using Front End Estimation of Sums


Adding using Front End Estimation of Sum

When finding the sum of several numbers, one
way to estimate the sum is called "front-end' 

In front end estimation of sum you add only the
first digit of the numbers. The other digits are
replace by zeros.  Example:

Add 5524 and 3452 using front end estimation of sum.

Front end addition

Front-end estimation always gives a sum
less than the actual sum.

Normal addition