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HCF - HIGHEST COMMON FACTOR


The highest common factor (HCF) of two whole numbers
is the largest whole number which is a factor of both. 

Consider the numbers 12 and 15 :


The factors of 12 are : 1, 2, 3, 4, 6, 12.
The factors of 15 are : 1, 3, 5, 15.


1 and 3 are the only common factors (numbers which are factors of both 12 and 15).

 

Therefore, the highest common factor of 12 and 15 is 3.


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