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101-B1-2
2. Use the GCF of the two numbers to find the common factors.
Example
Common factors of two numbers are the same as the factors of the GCF of the
two numbers.
8 , 28
The GCF of 8 and 28: 4
Common factors of 8 and 28:
a.
30 , 45
The GCF of 30 and 45: 15
Common factors of 30 and 45:
b.
32 , 80
The GCF of 32 and 80: 16
Common factors of 32 and 80:
c.
28 , 42
The GCF of 28 and 42: 14
Common factors of 28 and 42:
2. Use the GCF of the two numbers to find the common factors.
Example
Common factors of two numbers are the same as the factors of the GCF of the
two numbers.
8 , 28
The GCF of 8 and 28: 4
Common factors of 8 and 28:
a.
30 , 45
The GCF of 30 and 45: 15
Common factors of 30 and 45:
b.
32 , 80
The GCF of 32 and 80: 16
Common factors of 32 and 80:
c.
28 , 42
The GCF of 28 and 42: 14
Common factors of 28 and 42:
