What is the GCF of 6, 18 and 30?

What's the Greatest Common Factor (GCF) of 6, 18 and 30?

Answer

GCF of 6, 18 and 30 is

6

Common factors: 1, 2, 3, 6

6 divides all three: 6 ÷ 6 = 1, 18 ÷ 6 = 3, 30 ÷ 6 = 5 — and 1, 3 and 5 have no factor but 1 common to all of them, so no larger number divides all three.

6 = 2 × 3

18 = 2 × 3²

30 = 2 × 3 × 5

Prime	6	18	30	Lowest power
2	2	2	2	2
3	3	3²	3	3
5	—	—	5	—

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

GCF = 2 × 3 = 6

More with these numbers

Related Calculations

GCF Table

1st	2nd	3rd	GCF
6	15	18	3
6	16	18	2
6	17	18	1
6	18	18	6
6	18	19	1
6	18	20	2
6	18	21	3
6	18	22	2
6	18	23	1
6	18	24	6
6	18	25	1
6	18	26	2
6	18	27	3
6	18	28	2
6	18	29	1
6	18	30	6
6	18	31	1
6	18	32	2
6	18	33	3
6	18	34	2
6	18	35	1
6	18	36	6
6	18	37	1
6	18	38	2
6	18	39	3
6	18	40	2
6	18	41	1
6	18	42	6
6	18	43	1
6	18	44	2

GCF for 6, 18 and 30

What's the Greatest Common Factor (GCF) of 6, 18 and 30?

More with these numbers

Related Calculations

See Also

GCF Table

FAQ

What's the Greatest Common Factor (GCF) of 6, 18 and 30?

What prime factors do 6, 18 and 30 share?

Can you get the GCF of 6, 18 and 30 two numbers at a time?

How does the GCF simplify the ratio 6 : 18 : 30?

See Also

1st	2nd	3rd	GCF
6	15	18	3
6	16	18	2
6	17	18	1
6	18	18	6
6	18	19	1
6	18	20	2
6	18	21	3
6	18	22	2
6	18	23	1
6	18	24	6
6	18	25	1
6	18	26	2
6	18	27	3
6	18	28	2
6	18	29	1
6	18	30	6
6	18	31	1
6	18	32	2
6	18	33	3
6	18	34	2
6	18	35	1
6	18	36	6
6	18	37	1
6	18	38	2
6	18	39	3
6	18	40	2
6	18	41	1
6	18	42	6
6	18	43	1
6	18	44	2

1st	2nd	3rd	GCF
6	15	18	3
6	16	18	2
6	17	18	1
6	18	18	6
6	18	19	1
6	18	20	2
6	18	21	3
6	18	22	2
6	18	23	1
6	18	24	6
6	18	25	1
6	18	26	2
6	18	27	3
6	18	28	2
6	18	29	1
6	18	30	6
6	18	31	1
6	18	32	2
6	18	33	3
6	18	34	2
6	18	35	1
6	18	36	6
6	18	37	1
6	18	38	2
6	18	39	3
6	18	40	2
6	18	41	1
6	18	42	6
6	18	43	1
6	18	44	2

1st	2nd	3rd	GCF
6	15	18	3
6	16	18	2
6	17	18	1
6	18	18	6
6	18	19	1
6	18	20	2
6	18	21	3
6	18	22	2
6	18	23	1
6	18	24	6
6	18	25	1
6	18	26	2
6	18	27	3
6	18	28	2
6	18	29	1
6	18	30	6
6	18	31	1
6	18	32	2
6	18	33	3
6	18	34	2
6	18	35	1
6	18	36	6
6	18	37	1
6	18	38	2
6	18	39	3
6	18	40	2
6	18	41	1
6	18	42	6
6	18	43	1
6	18	44	2