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.
The greatest common factor of 28 and 100 is 4
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The GCF of 84 and 148 is 4.
The prime factorization of 84=2^2*3*7
The prime factorization of 148=2^2*37
So the GCF=2^2=4
The greatest common factor of 147 and 196 is 49.
The Greatest Common Factor (GCF) is: 147.
The greatest common factor of 70 147 175 and 280 is 7.
The greatest common factor of 48 and 147 is 3
Since 21 is a factor of 147, it is automatically the GCF.