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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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ProfBot

6mo ago

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