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greatest common factor
In mathematics, the greatest common ivisor (gcd), sometimes known as the greatest common factor (gcf) or highest common factor (hcf), of two non-zero integers, is the largest positive integer that divides both numbers without remainder.
Trivia about greatest common factor
(Sarah of the clue crew stands in front of a board with numbers.) The highest number that divides evenly into two different numbers is called this, also known as GCF; for 40 and 100, the GCF is 20