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prime factors first:

64 = 2 * 2 * 2 * 2 * 2 * 2

72 = 2 * 2 * 2 * 3 * 3

90 = 2 * 3 * 3 * 5

gcf is 2

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12y ago
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Q: What is the gcf of 64 72 and 90?
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