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13 December, 12:56

What is the greatest common factor of 63 and 21

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Answers (2)
  1. 13 December, 13:34
    0
    Answer: 21

    Step-by-step explanation: To find the greatest common factor for the numbers 21 and 63, make a factor tree for each of the numbers.

    21 is 3 * 7.

    63 is 3 * 21 and 21 is 3 * 7.

    The greatest common factor therefore is 3 * 7 or 21.
  2. 13 December, 14:23
    0
    Factors of 21={1,3,7,21}

    Factors of 63={1,3,7,9,21,63}

    the highest common factor (HCF) is 21.
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