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March 28, 2017

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How would I solve these two problems. (We have to simplify our answer)

5/7 divided by 8/21

12/7 divided by 9/21

  • Math-Fractions - ,

    I will do the first, you do the second

    5/7 divided by 8/21
    = (5/7)รท(8/21)
    = (5/7)(21/8)
    = 15/8 , (the 7 cancelled into the 21)

  • Math-Fractions - ,

    I'd like to learn this. How did you get 15/8. Did you multiply 5 by 3 to get that?

  • Math-Fractions - ,

    yes, to multiply fractions, you multiply the numerators, and you multiply the denominators.

    e.g.

    2/3 x 5/7 = 10/21

    in your question of
    (5/7)(21/8)
    I had 105/56
    = 15/8 after dividing top and bottom by 7

  • Math-Fractions - ,

    that's cool. Thanks

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