2 x 3 x 5 = 30
2 x 3 x 7 = 42
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Prime factorization is one of the ways you find the HCF.
21 isn't prime. The prime factorization of 42 is 2 x 3 x 7.
2 x 3 x 5 = 302 x 23 = 46
Example: 30 and 42 30 15,2 5,3,2 42 21,2 7,3,2 Combine the factors, eliminating duplicates. 2 x 3 x 5 x 7 = 210, the LCM
Example: 30 and 42 Factor them. 2 x 3 x 5 = 30 2 x 3 x 7 = 42 Select the common factors. 2 x 3 = 6, the GCF