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27 April, 07:30

what is the LCD of 2/7 and 9/10

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Answers (2)
  1. 27 April, 08:15
    0
    Assuming LCD means Lowest Common Denominator

    Assuming by "and" you mean adding the two

    Well, you go by the multiples of 7;

    7, 14, 21, 28, 35, 42, 49, 56, 63, 70

    Multiples of 10;

    10, 20, 30, 40, 50, 60, 70, 80, 90, 100

    Straight away you can see the lowest common multiple is 70,

    Now to go about adding them,

    2/7 * 10 (both sides), 20/70

    9/10 * 7 (both sides), 63/70

    Then you add the two; 20/70 + 63/70 - now we can add them because they share the same denominator

    20/70 + 63/70 = 83/70 = 1 whole 13/70 (simplified)

    The LCD is 70

    Quick tip, to find a common multiple (not necessarily the lowest) multiply the two denominators.
  2. 27 April, 09:49
    0
    The least common denominator or LCD is 70 because for

    10=10,20,30,40,50,60,70,80

    7=7,14,21,28,35,42,49,56,63,70,77

    and 70 is the least common denominator of 10 and 7 so 70 ims your answer
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