Math
posted by Alex L. .
I am stuck on doing this math problem written on a sheet of paper.
(eightyone thousand minus fiftyfive thousand, four hundred fiftysix)
It mas to be done manually, without a calculator.

These sites should help you figure out how to do your problem.
http://www.mathplayground.com/howto_regroupI.html
http://www.mathsisfun.com/numbers/subtractionregrouping.html