Example: 30 and 42
Factor them.
2 x 3 x 5 = 30
2 x 3 x 7 = 42
Select the common factors.
2 x 3 = 6, the GCF
3k
To get the Greates Common Factor (GCF) of 30 and 105 we need to factor each value first and then we choose all the copies of factors and multiply them:30: 2 3 5 105: 3 5 7 GCF: 3 5The Greates Common Factor (GCF) is: 3 x 5 = 15
You do a factor rainbow to find a prime factorization. You compare prime factorizations to find a greatest common factor.
Find out about factors and factor trees.
7
You need at least two numbers to find a GCF.
What is the Greatest common factor of 21 and 84
6.
the greatest common factor is 10
The Greatest Common Factor (GCF) is: 6
It is one
1
The GCF is 17.
6
10
3
3k