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-- List all the factors of 15.
-- List all the factors of 30.
-- Spot the group of numbers that are on both lists.
-- The biggest one of those is the GCF. It should be close to 15.
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∙ 10y agoThis answer is:
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Wiki User
∙ 8y agoSince 15 is a factor of 30, it is automatically the GCF.
3 x 5 = 15
2 x 3 x 5 = 30
Select the common factors.
3 x 5 = 15, the GCF.
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