2^3 x 5 = 40
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Prime factorization of 288 = 2x2x2x2x2x3x3Prime factorization of 40 = 2x2x2x5Prime factorization of 24 = 2x2x2x32x2x2 = 8, the GCF
prime factorization of 40: 2 x 2 x 2 x 5
40 20,2 10,2,2 5,2,2,2
Method of prime factorization is one of the best method to find out greatest common factor.Prime factorization of 32 = 2x2x2x2x2Prime factorization of 8 = 2x2x2Prime factorization of 40 = 2x2x2x52x2x2 is a factor of each number. Also, it is the greatest number which divides 32, 8 and 40. So, gcf is 8.See the related links below to know more about prime factorization.
The GCF of 20 and 66 is 2. The prime factorization of 20 is 2*2*2 The prime factorization of 66 is 2*3*11 Their only common factor is 2, so it is their GCF.