18
9,2
3,3,2
30
15,2
5,3,2
42
21,2
7,3,2
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highest common factor is 6
42 21,2 7,3,2
A Factor tree looks like this: ... 42 ... / . \ ..2 ...21 ....... / . \ .......3 . 7 So the prime factors of 42 are 2 x 3 x 7
84 42 2 21 2 2 square root of 21 84 2 42 factor tree 6 7 2 3
The GCF of 24, 30, and 42 is 6.The GCF is 6.