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Prime factorization of 210 = 2 x 3 x 5 x 7
Prime factorization of 45 = 3 x 3 x 5
There is one 5 and one 3 in common.
GCF = 3 x 5 = 15.
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Since 45 is a factor of 270, it is automatically the GCF.
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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 180 and 231 is 3
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