3
10
2,5
90 10 9 5 5 3 3
30 3 10 2 5 3, 2 and 5
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.
10 2,5
10,3 5,2,3 30 3 10 2 5 3, 2 and 5
the factor tree of 9 is 3 squared, or 3 x 3. 9 breaks down into 3 and 3.
10 2, 5
330 3, 110 3, 10, 11 3, 2, 5, 11
1,350 / \ 135*10 / \ / \ 9*15 2*5 / \ / \ 3*3 3*5
2 and 5
10 2,5
10 2,5