Mike Byster 
(C.V.), aka Human Calculator, is a math volunteer teacher in Chicago area. He has one of the fastest mathematical minds in the world, and can answer complex math problems in front of his students instantaneously. Mike created a system for solving complex math problems he calls "Mike's Math." The system uses a series of patterns and shortcuts that demystify how numbers work.
Link to ABC to read the full report of 'Mike's Math', or you want your children trained on "Mike's Math" seminars, please visit http://www.mikesmath.com