Math magic

[franz32]

Hello everyone!

Can anyone help me.... does anyone know any site that shows math magics or math tricks?[a)]

[himanshu121]

http://www.cut-the-knot.org/front.shtml

[KLscilevothma]

a card trick (http://nrich.maths.org/mathsf/journalf/dec03/art3/index.html)