This trick makes you look like your brain is a mega fast calculator!
Ask a friend to write down ANY three digit number such as 231 or 884. Ask them to multiply the number by
THE SECRET: all you do is write out the starting number twice! So 231 will become 231231 and 884 will become 884884. You don't believe it? Well try it on this calculator and see for yourself! You work this calculator by clicking the mouse on the buttons. Go on, put in ANY three digit number then x7 x11 x 13 and see what you get!
This trick is very similar to the 7-11-13 trick.
This trick is similar to the 3-7-13-37 trick. It's harder to do, but it looks far more miraculous!
One of our MM fans who calls himself TOMATH told us about an even bigger version of this trick:
Links:
The Murderous Maths main index page