Unknown Amazing, Simple and Easy Maths Tricks ..??

http://www.youtube.com/watch?v=7z4TRa1WXmo

http://www.youtube.com/watch?v=lH7DI2uveT8

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http://www.youtube.com/watch?v=Pt4K73ZWvLI

http://www.youtube.com/watch?v=EoqlUKKkdzw

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http://www.youtube.com/watch?v=lYbc3CDiIms

http://www.youtube.com/watch?v=8BDqn4Fmy7Q