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# Math tricks

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### Math tricks

1. 1. Amazing Math Tricks
2. 2. The 7-11-13 trick! Ask a friend to write down ANY three digit number such as 231 or 884. Ask them to multiply the number by: x7 x 11 x 13 ...but even if your friend has used a calculator, you will have written down the answer ages ago! Its fiendish! THE SECRET: all you do is write out the starting number twice! So 231 will become 231231 and 884 will become 884884. You dont 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!
3. 3. The 3367 trick! This trick is similar to the 7-11-13 trick. Its harder to do, but it looks far more miraculous! Get a friend to pick any 2 digit number e.g. 74 x 3367 To work out the final answer you have to imagine the original number written out three times e.g. 747474 then divide it by three. 249158 This one takes practice, but unlike the others, its very hard to see how its done!