I do really well if I have one form of arithmetic like addition, or subtraction. But as we all know math doesn't work like that sometimes. I will do silly things like 10/2 = 8, or 10*5 = 3. If you can understand what I am saying. I mix up my tables when I'm dealing with a long problem, and I was wondering if there was any trick to avoiding something like this when you're doing a long complicated problem?