Where can I learn "Quick" math - Help Hi, I don't mave MUCH of a Math back ground, mainly math used for the line of work I am in (Currency Analyst) and programming. However, i was just inspired by a film I watched about a math expert, who can do calculations in his head like 89 x 437, in like 5 seconds. Is there a site, or anything learning material that teaches you "Qucik" math that you can do in your head? I am not sure If I am explaining my self correct here, so just let me know. If not, ill try to be more specific. Any help would be great, thanks!