42
21,2
7,3,2
You need at least two numbers to find a GCF.
12 6,2 3,2,2 42 21,2 7,3,2 2 x 3 = 6, the GCF
gcf(30, 42) = 6. 30 = 2 x 3 x 5 42 = 2 x 3 x 7 hcf = 2 x 3 = 6
The factor tree is just a way to display the prime factorization. Once you have that, you can find the GCF. Example: 30 and 42 2 x 3 x 5 = 30 2 x 3 x 7 = 42 Select the common factors. 2 x 3 = 6, the GCF.
Since 7 is a factor of 42, it is automatically the GCF.
The GCF is 42.
Since 42 is a factor of 6048, it is automatically the GCF.
Since 21 is a factor of 42, it is automatically the GCF.
The greatest common factor of 6 and 42 is 6.6: 6,2,3,642: 1,2,3,6,7,14,21,42The GCF is: 6The GCF is 6.
The greatest common factor of 18 21 and 42 is 3.
The GCF of 7, 42, and 70 is 7.The GCF is 7.
The GCF of 7, 21, and 42 is 7, because 7 is a factor of all three.
Since 14 is a factor of 42, it is automatically the GCF.