whenever you start the factor tree always divide by the lowest number possible first...
2 * 5 * 3 * 3 * 3 = 270
2 = 2
5 = 5
9 = 3 * 3 * 3
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This is the factor tree of 270: 270 / \ 3 90 / \ 3 30 / \ 3 10 / \ 2 5 The 3's, 2, 5 would be prime so you would circle them.
75 25,3 5,5,3
275 55,5 11,5,5
63 21,3 7,3,3
63 21,3 7,3,3