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Whats the GCF of 18 and 30?

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Well I don't know !
Let's figure it out:

-- The factors of 18 are 1, 2, 3, 6, 9, and 18 .

-- The factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30 .

-- The numbers that are factors of both 18 and 30 (the 'common' ones)
are 1, 2, 3, and 6 .

-- The biggest one on that short list (the 'greatest common' one) is 6 .

User Rostislav Matl
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