(140) = 2 * (70)
(70) = 2 * (35)
(35) = 5 * 7
Prime factors of 140: 2,2,5 and 7
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140 70,2 35,2,2 7,5,2,2
The factor tree is as follows: 114 57,2 19,3,2
119 7,17
Since 61 is already prime, a factor tree is not necessary. The prime factorization of 51 is 3 x 17, which wouldn't make much of a tree. More like a factor shrub.
Yes - 7 is a factor of 140 because 7 x 20 = 140.