80
2, 40
2, 2, 20
2, 2, 2, 10
2, 2, 2, 2, 5
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80 / \ 40 2 / \ 20 2 / \ 10 2 / \ 5 2 24*5
the factor pairs of 80 are as shown: 1x80, 2x40, 5x16, 8x10, 4x20
Factor tree of 40: 40 20,2 10,2,2 5,2,2,2
Here is a factor tree of eight: 8 / \ 4 2 / \ 2 2
61 and 80 don't have a common factor (except 1 which doesn't count).