This was taken from a math contest a few months ago. 1. The problem statement, all variables and given/known data xx*yy=zz find z if: x=28 * 38 y=212 * 36 2. Relevant equations Theres undoubtably some trick, but I have yet to find it 3. The attempt at a solution Dont even think about calculator I showed my math teacher, and he was able to find that zz=2(211*37*11) * 3(211*37*7) or 249268736 * 331352832 How do you get z alone?