The common factors for the numbers 6 and 42 are: * 1 * 2 * 3 * 6
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The greatest common factor of 42 depends upon the other numbers with which 42 has COMMON factors. However, the greatest common factor HAS to be one of the factors of 42 which are: 1, 2, 3, 6, 7, 14, 21, 42.
The common factors are: 1, 2, 3, 6
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.
The Greatest Common Factor (GCF) of 36, 42, and 72 is 6. To find the GCF, you can list the factors of each number and identify the largest factor that is common to all three numbers. The factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, and 36. The factors of 42 are 1, 2, 3, 6, 7, 14, 21, and 42. The factors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72. The largest factor that is common to all three numbers is 6, making it the GCF.
The greatest common factor of the numbers 12 and 42 is 6.