Prime factors of 66 are 2 x 3 x 11.
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2 x 3 x 11
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.
61 is already prime. It doesn't need a tree.
The Greatest Common Factor of the three numbers is 6.
To get the prime factorization of 66, start with any of its factor pairs and keep factoring the numbers until they are all prime. 2 x 33 2 x 3 x 11 All the factors are prime, so the prime factorization is 2 x 3 x 11.