The GCF is 21.
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The GCF is: 7
The GCF is 21.
63 and 84's highest common factor is 21.
The first 5 multiples of 21 are: 21, 42, 63, 84, and 105.
To find the greatest common factor (GCF) of 63, 84, and 126, 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 84 are 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, and 84. The factors of 126 are 1, 2, 3, 6, 7, 9, 14, 18, 21, 42, 63, and 126. The GCF is the largest number that appears in all three lists, which in this case is 21.