In order to estimate, I'd suggest using numbers that are easier to do in your head...like 825*13...this way you will be able to break it into parts and come up with something close more easily...here we know 800*13 is 10,400 and then 25*13 is 325...now we add those together to get 10,725 as an estimate.

Now, we calculate the actual amount 832*13 to get 10,816...this is pretty close to our estimate, so it shows that our estimate was pretty good.