hcf = 18
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-- List factors of first number. -- List factors of second number. -- Make short list of all numbers on both factor lists. -- Biggest number on short list is greatest common factor of both numbers.
Applying Euclid's algorithm, the greatest common factor of 44 and 47 is the same as the greatest common factor of 44 and 3 - where 3 is the remainder of the division of 47 by 44.
The GCF is 6.
The GCF is 9.
The GCF is 4.