oh, yes, i know foil...but i meant other tricks like this to apply to all math. shortcuts, etc. foiling binomials is easy, i just never thought of it for basic 2digit multiplication. is there a way to do it with 3 digit numbers? ie (112)*(561)=
is there a book you know of that gives short...
ok, where do you learn tricks like THAT...like foiling two double digits? i have been through so much math and have never known that. very cool. i want more.