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.
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The GCF is what goes into the numbers, the LCM is what the numbers go into. 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 Combine the factors, eliminating duplicates. 2 x 3 x 5 x 7 = 210, the LCM.
The positive whole-number factors of 42 are: 1, 2, 3, 6, 7, 14, 21, and 42.
The lowest common multiple - is 42 !
Their lowest common multiple is 378
The numbers that go into both 12 and 20 are called common factors. To find the common factors of two numbers, you need to identify all the factors of each number and then determine which factors they have in common. The factors of 12 are 1, 2, 3, 4, 6, and 12, while the factors of 20 are 1, 2, 4, 5, 10, and 20. The common factors of 12 and 20 are 1, 2, and 4.