Why yes, it is.
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1, 2, 7 and 14 are the common factors of 28 and 42. Since all of the numbers are common factors, we will not be able to select two.
Factor both numbers. Select the factors they both have in common. Choose the largest (greatest) one.
Example: 30 and 42 List the factors. 1,2,3,5,6,10,15,30 1,2,3,6,7,14,21,42 Select the common factors. 1,2,3 and 6, the GCF.
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
Let's try one. 30x2y3z4 + 42x4y5z2 Do the numbers first. Factor them. 2 x 3 x 5 = 30 2 x 3 x 7 = 42 Select the common factors. 2 x 3 = 6 For the variables, select the lowest exponent. The GCF of the above expression is 6x2y3z2