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The greatest common factor (GCF) is often also called the greatest common divisor (GCD) or highest common factor (HCF). Keep in mind that these different terms all refer to the same thing: the largest integer which evenly divides two or more numbers.

The greatest common factor of 30, 60, and 90 is 30.

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12y ago
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11y ago

Factors of 30: 1, 2, 3, 5, 6, 10, 15, 30.

Factors of 90: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90.

Factors of 60: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60.

GCF (30, 90, 60) = 30

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Q: What is the greatest common factor of 30 60 and 90?
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