Estimate



Approximate calculation
Not exact

Estimate how many gum balls are in the machine?

Rounding numbers
Round to the nearest 10
greater than or equal to 5 goes higher
56=60
below 5 goes lower
54=50
http://www.aaamath.com/est.htm

http://www.math.com/school/subject1/lessons/S1U1L3GL.html

http://www.teach-nology.com/worksheets/math/estimate/

http://math.pppst.com/estimates.html


http://www.5min.com/Video/When-to-Estimate-in-GMAT-Math-334963226