Front end estimation is adding two or more numbers to get an estimated sum total. In front end estimation, the numbers are always rounded off to the lowest round number. Look here
http://www.ask.com/webanswers/Computers/Software/...

When using frontend estimation, we add or subtract the front digits, and then adjust for a more accurate estimation by estimating the sum of the digits to the right of the decimal
http://wiki.answers.com/Q/What_is_the_definition_o...

According to Newton's Law, an object at rest tends to stay at rest. When a car accelerates, the vehicle's body remains in place as power from the engine begins to push the car forward
http://www.ehow.com/facts_6614913_carliftupgoin...

Front end estimation mostly produces a closer estimate of sums or differences than the answer produced by adding or subtracting rounded numbers. How to estimate a sum by front end
http://answers.yahoo.com/question/index?qid=201003...
