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The prime factors of 18 are 2, 3 and 3.

The prime factors of 42 are 2, 3 and 7.

Thus, the prime factors which are common to both are 2 and 3.

However, the usual manner of answering this sort of question is to give the greatest common factor which is common to both (or all) numbers, and not only prime factors - so as 2 and 3 are common to both numbers and as 2 x 3 = 6 the 'other' answer to the question is 6.

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16y ago

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