Expert: Lynn Houston - 10/6/2008

Question
can you tell me how do you do estimation of sum? please and thank you. and can you tell me if i can go to an website for examples please and thank you

Answer
An easy way to estimate a sum is to round the numbers.  If you want to estimate 80, 205, 106, 140, 312, round all to nearest hundred and add.  So, 80 rounds to 100, 205 rounds to 200, 106 to 100, 140 to 100 and 312 to 300.  Now they're easy to add, 100+200+100+100+300 = 800.

For a website, check out purplemath.com