The greatest common factor of 18 and 21 is 3.
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16 over 21
Since 21 and 18 have the common factor of 3, reduce 'em to get: 21 to 18 = (3 * 7) to (3 * 6) = 7 to 6
The Greatest Common Factor of 14 and 21 is 7.
21 can not be divided by 2, ergo it can not be a common factor with 72
Highest common factor of 273 and 315 is 21.