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how to get the gcf of 16 & 39
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16 = 1*2^4
39 = 1*3*13
gcd are the products that are common, so gcd (16,39) = 1.
In fact if two numbers have the property gcd(a,b) =1, a and b are said to be "relatively prime"
factors of 16 are 1,2, 4, 8,16 right.
also look factors of 39 are 1,3,13,and 39
the common factor is 1 which is the highest ok. then gcd=1
More commonly we write out a number as a product of prime factors as this makes intersection of prime factors obvious.
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