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To find the greatest common factor (GCF) of these numbers, we first need to list the factors of each number. The factors of 63 are 1, 3, 7, 9, 21, and 63. The factors of 56 are 1, 2, 4, 7, 8, 14, 28, and 56. The factors of 42 are 1, 2, 3, 6, 7, 14, 21, and 42. The factors of 21 are 1, 3, 7, and 21. The greatest common factor among these numbers is 7.

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The greatest common factor is the highest number that divides exactly into two or more numbers.

21: 1, 3, 7, 21

42: 1, 2, 3, 6, 7, 14, 21, 42

56: 1, 2, 4, 7, 8, 14, 28, 56

63: 1, 3, 7, 9, 21, 63

The greatest common factor for 21, 42, 56 and 63 is 7.

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Wiki User

10y ago
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Q: What is the greatest common factor of 63 56 42 and 21?
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