Factors of 15 are 1, 3, 5, and 15. Factors of 63 are 1, 3, 7, 9, 21, and 63. The greatest common factor of 15 and 63 is 3.
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The highest common factor of 60 and 75 is 15
The Greatest Common Factor of 21, 63, 84: 21
Greatest common factor for 35 and 63 and 84 is 7.
The greatest common factor of 63, 84, and 105 is 21.
Since 7 is a factor of 63, it is automatically the GCF.