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3=1x3
30=2x3x5
33=3x11
gcf is 3

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15y ago
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12y ago

Because it is the largest number that can be divided into both 12 and 33 evenly with no remainder.

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Wiki User

11y ago

The GCF is 3.

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Q: Why is the greatest common factor of 21 15 and 12?
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