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The GCF of 21 and 690 is 3.
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Find HCF of: 42 & 1380 63 & 2070 7 & 230 105 & 3450 147 & 4830 42 & 690 21 & 1380 63 & 690 21 & 2070 105 & 690 21 & 3450 147 & 690 21 & 4830
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The greatest common factor (GCF) is also known as greatest common divisor (GCD) or highest common factor (HCF).
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