Estimating Addition and Subtraction Problems Involving Whole Numbers

This video explains how to round whole numbers to estimate addition and subtraction problems.

[aayaarns]

nice !!!! i did'n know rounding could be so easy in sums, its just rounding to the place value and knowing the rule of rounding up and down. : )

[rosariorubio]

Did anyone notice the last problem. It asked what the sum was, and he subtracted..

[kattarsanatani]

my teacher gave this link in my notebook entry

[xxappleheadxx]

hey 7 is a higher digit! the answer is supposed to be 3800!