Factors of 30 are: 1, 2, 3, 5, 6, 10, 15, and 30.
Factors of 36 are: 1, 2, 3, 4, 6, 9, 12, 18, and 36.
Common factors of 30 and 36 are: 1, 2, 3, and 6.
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The factors of 28 are:1, 2, 4, 7, 14, 28The factors of 36 are:1, 2, 3, 4, 6, 9, 12, 18, 36The common factors are: 1, 2, 4
The common factors of 21 and 36 are 1 and 3
The common factors of 36 and 38 are 1 and 2. first find all factors of 38 and 36: The factors of 36 are 1, 2, 3, 4, 6, 9, 12, and 36 The factors of 38 are 1, 2, 19, and 38 now see what they have in common 1 and 2 so the common factors of 38 and 36 are 1 and 2.
There cannot be a greatest common factor (GCF) of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.
The factors of 36 are 1,2,3,4,6,9,12,18,and 36.The factors of 74 are 1,2,and 37.The greatest common factor of 36 and 74 is 2.