Multiply 99 by 98 in your head!

1. 21

   Math Tricksposted 2 years ago

   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?

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2. 90

   Migoddenposted 2 years ago

   Hah! awesome trick, I already knew it though

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   lorlie6posted 2 years ago

   I can't even do that on paper, for God's sake!

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   Migoddenposted 2 years ago

   Read the hub, you'll be able to do it after for sure. lol

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5. 99

   rebekahELLEposted 2 years ago

   yep, know that one, my sons taught me!

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   EYEAM4ANARCHYposted 2 years ago

   Before I look, I'm guessing you multiply 99 by 100 and subtract 198.

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7. 90

   EYEAM4ANARCHYposted 2 years ago

   I think my trick is easier. 8^D

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   Math Tricksposted 2 years ago

   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

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9. 90

   Migoddenposted 2 years ago

   When/what are you doing your next trick about ?

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10. 21

    Math Tricksposted 2 years ago

    I haven't decided yet, do you think it should be another arithmetic trick or a cool puzzle!?

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