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 150, 210, and 330 is 30.
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The greatest common factor of 170 and 210 is 10
The greatest common factor of 105, 126, and 210 is 21
The GCF of 210, 252, and 294 is 42
210
The greatest common factor of 2940 and 3150 is 210. Source: http://www.mathwarehouse.com/arithmetic/numbers/GCF/greatest-common-factor-calculator.php