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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IT IS PRIME there is no factor tree
The factor tree of 50:5025,25,5,25025,25,5,2
21
The factor tree for 148: 148 74,2 37,2,2
Factor tree for 49:49/ \7 x 7497,7