The GCF is 42.
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The greatest common factor of the numbers 210 and 84 is 42.
The GCF is 14.
210 and 420 have a GCF of 210.
The GCF is 6. The greatest common factor is the highest number that divides exactly into two or more numbers. 84: 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84 90: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90 The GCF for 84 and 90 is 6.
If that's 28, 56 and 84, the GCF is 28. If that's 2856 and 84, the GCF is 84.