231 ÷ 7 = 33
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3 x 77 7 x 33 11 x 21
For 126: 2, 3 and 7 For 231: 3, 7 and 11
7 = 105 / 15
71 ÷ 9 = 7 with remainder 8
To find the common factors of 42 and 231, we first need to find the prime factorization of each number. The prime factorization of 42 is 2 x 3 x 7, and the prime factorization of 231 is 3 x 7 x 11. The common factors of 42 and 231 are the prime numbers that appear in both factorizations, which are 3 and 7. Therefore, the two common factors of 42 and 231 are 3 and 7.