Which fraction is in reduced form?

Question

Which fraction is in reduced form?
A 4/20 B 6/9 C 5/13 D 14/21

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Allison 1 month 2021-09-12T05:01:32+00:00 1 Answer 0

Answers ( )

    0
    2021-09-12T05:03:15+00:00

    Answer:

      C  5/13

    Step-by-step explanation:

    A fraction is written in reduced form if there are no common factors in the numerator and denominator. Since you know your multiplication tables, you can easily identify the common factors:

      A 20 = 5·4, so 4 is a common factor 4/(4·5) = 1/5

      B 6 = 2·3, 9 = 3·3, so 3 is a common factor (2·3)/(3·3) = 2/3

      C 13 is not a multiple of the prime number 5, so there are no common factors. 5/13 is a reduced fraction

      D 14 = 2·7, 21 = 3·7, so 7 is a common factor (2·7)/(3·7) = 2/3

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45:7+7-4:2-5:5*4+35:2 =? ( )