2 x 3 x 3 x 7 = 126
2 x 3 x 5 x 7 = 210
2 x 3 x 7 = 42, the GCF
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105 = 3 x 5 x 7; 210 = 2 x 3 x 5 x 7; 126 = 2 x 3 x 3 x 7.
Common factors are 3 and 7 so HCF = 21
The GCF is 7.
The greatest common factor of 126 and 210 is 42. The greatest common factor (GCF) is often also called the greatest common divisor (GCD) or highest common factor (HCF). Keep in mind that these different terms all refer to the same thing: the largest integer which evenly divides two or more numbers.
210 and 420 have a GCF of 210.
The GCF of 54, 90, and 126 is 9
The GCF is 42.