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Math Help - Dividing fractions

  1. #1
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    Dividing fractions

    Im working through a book "Maths for Science" and here is another example I dont understand:

    For example, 5/15 can be simplified by dividing the numerator
    and denominator by 3 to get 1/3

    This is what I dont understand how can the numerator be divided by 3? 5 divided by 3 is 1.666666667 on my calculator!

    Although I instantly know 5/15 is also 1/3 in my mind.

    $ilver
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  2. #2
    Flow Master
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    Quote Originally Posted by $ilver View Post
    Im working through a book "Maths for Science" and here is another example I dont understand:

    For example, 5/15 can be simplified by dividing the numerator
    and denominator by 3 to get 1/3 Mr F says: The red 3 should be a 5 (since 5 is the common factor of 5 and 15).

    This is what I dont understand how can the numerator be divided by 3? 5 divided by 3 is 1.666666667 on my calculator!

    Although I instantly know 5/15 is also 1/3 in my mind.

    $ilver
    ..
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  3. #3
    Moo
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    Hello !

    No, they divided the numerator and denominator by 5.

    See :

    \frac 5{15}=\frac{{\color{red}5} \times 1}{{\color{red}5} \times 3}

    So this can be simplified :
    \frac{5 \times 1}{5 \times 3}=\frac 55 \times \frac 13=1 \times \frac 13

    and gives the result ^^
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  4. #4
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    lol thanks guys no wonder I was confused! Its a typing error then

    $ilver
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