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The greatest common factor is 6.

30 = 6 x 5

78 = 6 x 13

90 = 6 x 15

180 = 6 x 30

Finding common factors (2 x 3 = 6)

30 = 2 x 3 x 5

78 = 2 x 3 x 13

90 = 2 x 3 x 3 x 5

180 = 2 x 2 x 3 x 3 x 5

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Q: What is the GCF of 30 78 90 and 180?
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