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Put the number you want to factor at the top. Each successive "branch" breaks the number into factors, then factors of factors. When all the factors are prime, the tree is complete.

Example: 210

210 Divide by two.

105,2 Divide by three.

35,3,2 Divide by five.

7,5,3,2 Stop.

2 x 3 x 5 x 7 = 210

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Q: How do you do a factor tree?
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