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 Description  
 Greatest Common Factor (GCF):  The largest factor that two or more numbers have in common.
Numbers
Factors
Common Factors
GCF
15
±1, ±3, ±5, ±15
±1, ±5
5
25
±1, ±5, ±25

Numbers
Factors
Common Factors
GCF
36
±1, ±2, ±3, ±4, ±6, ±9, ±12, ±18, ±36
±1, ±2, ±3, ±4, ±6, ±12
12
24
±1, ±2, ±3, ±4, ±6, ±8, ±12, ±24

Numbers
Factors
Common Factors
GCF
30
±1, ±2, ±3, ±5, ±6, ±10, ±15, ±30
±1, ±2, ±5, ±10
10
20
±1, ±2, ±4, ±5, ±10, ±20
50
±1, ±2, ±5, ±10, ±25

Example of Relatively Prime Numbers

Numbers
Factors
Common Factor
GCF
32
±1, ±2, ±4, ±8, 16, ±32
±1
1
65
±1, ±5, ±13, ±65

Note that in this example neither 32 nor 65 are prime. Since they have the number 1 as the only common factor, 32 and 65 are relatively prime to each other.