To estimate math products rather than the actual answer, you will need to round the answers to the nearest whole number. It is recommended to round up into the tens (10, 20, 30, etc
http://answers.ask.com/Computers/Software/how_to_e...

If the last digit of a number is 1, 2, 3 or 4, round that digit down to the nearest group of 10 (10, 20, 30, 40, etc. For example, 12 would be rounded down to 10. If the last digit
http://www.ehow.com/info_8432810_ballparkestimate...

An estimated math answer is one that is guessed based on what you know without actually doing the problem.
http://wiki.answers.com/Q/What_is_an_estimated_mat...

In order: Real revenue  this is the best. Real traction  especially if it is growing and there is a plausible story that it will lead to revenue. "Estimates" of any kind
http://www.quora.com/WhatismoreimportanttoVCs...
