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101-B2-1
Using Prime Factorization to Find the GCF
1. Find the greatest common factor as shown in the example.
Example
20 , 30 30 20
20 30
a. 28 , 42 The GCF: 7
28 42
76 28
42
b. 18 , 30 The GCF:
18 30
18
30
The GCF:
Using Prime Factorization to Find the GCF
1. Find the greatest common factor as shown in the example.
Example
20 , 30 30 20
20 30
a. 28 , 42 The GCF: 7
28 42
76 28
42
b. 18 , 30 The GCF:
18 30
18
30
The GCF:
