What is the GCF of 6, 9 and 18?

What's the Greatest Common Factor (GCF) of 6, 9 and 18?

Answer

GCF of 6, 9 and 18 is

3

Common factors: 1, 3

3 divides all three: 6 ÷ 3 = 2, 9 ÷ 3 = 3, 18 ÷ 3 = 6 — and 2, 3 and 6 have no factor but 1 common to all of them, so no larger number divides all three.

6 = 2 × 3

9 = 3²

18 = 2 × 3²

Prime	6	9	18	Lowest power
2	2	—	2	—
3	3	3²	3²	3

— = power 0: the prime is not a factor of this number, so it cannot be in the GCF.

GCF = 3

More with these numbers

Related Calculations

GCF Table

1st	2nd	3rd	GCF
3	6	9	3
4	6	9	1
5	6	9	1
6	6	9	3
6	7	9	1
6	8	9	1
6	9	9	3
6	9	10	1
6	9	11	1
6	9	12	3
6	9	13	1
6	9	14	1
6	9	15	3
6	9	16	1
6	9	17	1
6	9	18	3
6	9	19	1
6	9	20	1
6	9	21	3
6	9	22	1
6	9	23	1
6	9	24	3
6	9	25	1
6	9	26	1
6	9	27	3
6	9	28	1
6	9	29	1
6	9	30	3
6	9	31	1
6	9	32	1

GCF for 6, 9 and 18

What's the Greatest Common Factor (GCF) of 6, 9 and 18?

More with these numbers

Related Calculations

See Also

GCF Table

FAQ

What's the Greatest Common Factor (GCF) of 6, 9 and 18?

What prime factors do 6, 9 and 18 share?

Can you get the GCF of 6, 9 and 18 two numbers at a time?

How does the GCF simplify the ratio 6 : 9 : 18?

See Also

1st	2nd	3rd	GCF
3	6	9	3
4	6	9	1
5	6	9	1
6	6	9	3
6	7	9	1
6	8	9	1
6	9	9	3
6	9	10	1
6	9	11	1
6	9	12	3
6	9	13	1
6	9	14	1
6	9	15	3
6	9	16	1
6	9	17	1
6	9	18	3
6	9	19	1
6	9	20	1
6	9	21	3
6	9	22	1
6	9	23	1
6	9	24	3
6	9	25	1
6	9	26	1
6	9	27	3
6	9	28	1
6	9	29	1
6	9	30	3
6	9	31	1
6	9	32	1

1st	2nd	3rd	GCF
3	6	9	3
4	6	9	1
5	6	9	1
6	6	9	3
6	7	9	1
6	8	9	1
6	9	9	3
6	9	10	1
6	9	11	1
6	9	12	3
6	9	13	1
6	9	14	1
6	9	15	3
6	9	16	1
6	9	17	1
6	9	18	3
6	9	19	1
6	9	20	1
6	9	21	3
6	9	22	1
6	9	23	1
6	9	24	3
6	9	25	1
6	9	26	1
6	9	27	3
6	9	28	1
6	9	29	1
6	9	30	3
6	9	31	1
6	9	32	1

1st	2nd	3rd	GCF
3	6	9	3
4	6	9	1
5	6	9	1
6	6	9	3
6	7	9	1
6	8	9	1
6	9	9	3
6	9	10	1
6	9	11	1
6	9	12	3
6	9	13	1
6	9	14	1
6	9	15	3
6	9	16	1
6	9	17	1
6	9	18	3
6	9	19	1
6	9	20	1
6	9	21	3
6	9	22	1
6	9	23	1
6	9	24	3
6	9	25	1
6	9	26	1
6	9	27	3
6	9	28	1
6	9	29	1
6	9	30	3
6	9	31	1
6	9	32	1