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By using the divisibility rules, I can tell that 864 is divisible by 2, 3, 4, 6, 8 and 9. By dividing those numbers into 864 I can create factor pairs, any of which I can use to start the tree.

864

432,2

216,2,2

108,2,2,2

54,2,2,2,2

27,2,2,2,2,2

9,3,2,2,2,2,2

3,3,3,2,2,2,2,2

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Q: How can you use divisibility rules to make a factor tree for 864?
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