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Academic questions...

Discussion in 'Science and Technology' started by Satya, Jun 23, 2009.

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  1. Satya

    Satya C'est la vie
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    Without a calculator, is there a faster way to reduce fractions than by factoring?
     
  2. Puck

    Puck Perilous Pixie
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  3. OP
    Satya

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    That's corny even by INFJ standards.
     
  4. Puck

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  5. Shai Gar

    Shai Gar Guest

    Long Division. It's easier than you think.
     
  6. OP
    Satya

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  7. OP
    Satya

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    I suck at long division.
     
  8. Azure_Knight

    Azure_Knight Community Member

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    I suck at math XD
     
  9. gloomy-optimist

    gloomy-optimist Used to live here

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    I just don't reduce them, if I can get away with it. If I know how to come up with the answer, then whoever is looking at the result can reduce their own damn fraction if they're that particular
     
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  10. Milon

    Milon Director of Glomps
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    Factoring really isn't that bad. You just have to know the trick for 2, 3, 4, and 5. You'll rarely need anything higher.

    Wow, Euclidean Algorithm! I completely forgot about that! Great find! :)
     
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    Satya

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    There's a trick?
     
  12. gloomy-optimist

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    Well, there are a few:

    Even numbers can be factored by two.
    If you add both digits together and that number is divisible by three, then the original number is divisible by three (63 --> 6+3=9 --> 63 is divisible by three)
    I forget the rule to four, but that's okay cuz I never check for four anyways.
    If the number ends in a 5 or 0, it is divisible by five.
    If a number is divisible by both two and three, then it is divisible by six.
     
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    Satya

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    Wow, I did not know the tricks for the second and last one. It feels like my elementary education was seriously lacking in the math department. I wonder what the trick for 4 is.
     
  14. Cecilff2

    Cecilff2 Emancipator of Poultry

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    You don't really need a trick for 4. If it's divisable by 4 just use 2, since they're both even.
     
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  15. gloomy-optimist

    gloomy-optimist Used to live here

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    ^^ That's what I always do. There's really not much point in checking.

    There is a pattern with four, like all the other numbers, that's not too hard to figure out:
    4, 8, 12, 16, 20 || 24, 28, 32, 36, 40...
    ends in: 4, 8, 2, 6, 0 || 4, 8, 2, 6, 0...
    So if it's divisible by four, it would end in one of those numbers, in increments of 20
     
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