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.
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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
Here are some possible combinations: 2 x 135 3 x 90 5 x 54 6 x 45 9 x 30 10 x 270
factor tree of 216
The prime factor tree of 280 is:140,270,2,235,2,2,27,5,2,2,2
using whole numbers 1*2*3*3*3*5=270