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3
The greatest common factor of the numbers 63 and 15 is 3.
'6' has the factors, 1,2,3& 6. '15' has the factors od 1,3,5 & 15. '3' is the ONLY common and highest factor to both numbers. . Hence '3' is the HCF.
15
All numbers have factors. Some numbers have some of the same factors as other numbers. These are known as common factors. 3 is a factor of 9. 3 is a factor of 15. 3 is a common factor of 9 and 15.