Multiply 99 by 98 in your head!

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  1. profile image0
    Math Tricksposted 9 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?

  2. Migodden profile image78
    Migoddenposted 9 years ago

    Hah! awesome trick, I already knew it though wink

  3. lorlie6 profile image84
    lorlie6posted 9 years ago

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

  4. Migodden profile image78
    Migoddenposted 9 years ago

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

  5. rebekahELLE profile image88
    rebekahELLEposted 9 years ago

    yep, know that one, my sons taught me!

  6. EYEAM4ANARCHY profile image84
    EYEAM4ANARCHYposted 9 years ago

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

  7. EYEAM4ANARCHY profile image84
    EYEAM4ANARCHYposted 9 years ago

    I think my trick is easier. 8^D

  8. profile image0
    Math Tricksposted 9 years ago

    Eyeam,your trick is awesome! Try multiplying 89 * 92 though big_smile. Gets a bit tougher! If you practise the trick in the hub you will begin doing those multiplications unconsiously! 8188 Btw ;D

  9. Migodden profile image78
    Migoddenposted 9 years ago

    When/what are you doing your next trick about ?

  10. profile image0
    Math Tricksposted 9 years ago

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

 
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