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3 April, 14:31

5/6, 7/18, 5/9, 2/72

a. determine the lcd of the above by inspection. lcd by inspection

b. determine the lcd of the above by division of prime numbers. lcd by division of prime numbers

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  1. 3 April, 14:42
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    a. LCD by inspection:

    Write the multiples and take a consideration to 72,

    6 = 0, 6, 12, 18, 24, 30, 36, 42, 48, 54, 60, 72, 78

    18 = 0, 18, 36, 54, 72, 90

    9 = 9, 18, 27, 36, 45, 54, 63, 72, 81

    72 = 0, 72, 144,

    So if we observe the lowest common multiple is 72.

    b. LCD by division of prime numbers

    Write the factors of the denominators 6, 18, 9, 72

    6 = 2 x 3

    18 = 2 x 3 x 3

    9 = 3 x 3

    72 = 2 x 2 x 2 x 3 x 3

    The LCD = 2 x 2 x 2 x 3 x 3 = 72
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