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15. Cause it would be 15x5=75. And the common factor can't be higher than the lowest number. The factors of 15 are 15&1, 5&3. The factors of 75 are 75&1, 25&3, 15&5.(I think that's all) then the highest is the #15. **************[[If I'm wrong someone correct me, please!!]]

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14y ago

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The GCF is 15.

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12y ago
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7878787878787

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Q: What is the high common factor for 15 and 75?
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