I'm giving myself a challenge, i will post one cool new math trick every day for one month on this account! I've made the first math trick, how to multiply 99 by 98 (and other numbers close to 100) in your head, in 5-6 seconds.
http://hubpages.com/hub/Math-Tricks-Mul … -your-head
Check out my hub and let me know how i could improve it! I.e am I clear, should i add more examples, any gadgets i could add?
Before I look, I'm guessing you multiply 99 by 100 and subtract 198.
Eyeam,your trick is awesome! Try multiplying 89 * 92 though . Gets a bit tougher! If you practise the trick in the hub you will begin doing those multiplications unconsiously! 8188 Btw ;D
I haven't decided yet, do you think it should be another arithmetic trick or a cool puzzle!?
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