Highest common factor of 273 and 315 is 21.
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The GCF is 15.
As the word "common" might suggest, HCF is normally defined for two or more numbers, not just one. The highest "common" factor of a single number will be itself so the answer to the question is 315.
588/315 = 315/315 + 273/315 = 1 + 13/15 = 1 13/15