The pair of numbers that have a greatest common factor of 3 are:
- 6 and 9
- 18 and 15
- 3 and 9
The factors of 6 and 9 are:
6 ⇒ 1, 2, 3 and 6
9 ⇒ 1, 3, 9
The greatest common factor here is therefore 3.
The factors of 18 and 15 are:
18 ⇒ 1, 2, 3, 6, 9 and 18
15 ⇒ 1, 3, 5, and 15
Greatest common factor is also 3
The factors of 3 and 9 are:
3 ⇒ 1 and 3
9 ⇒ 1, 3, 9
Greatest common factor here is also 3.
The pairs of 6 and 9, 18 and 15, and 3 and 9 all have the same highest common factor of 3.
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