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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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11y ago
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8y ago

Since 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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Q: How do you get the GCF of 15 and 30?
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