What is the GCF of 12, 18 and 30?

What's the Greatest Common Factor (GCF) of 12, 18 and 30?

Answer

GCF of 12, 18 and 30 is

6

Common factors: 1, 2, 3, 6

6 divides all three: 12 ÷ 6 = 2, 18 ÷ 6 = 3, 30 ÷ 6 = 5 — and 2, 3 and 5 have no factor but 1 common to all of them, so no larger number divides all three.

12 = 2² × 3

18 = 2 × 3²

30 = 2 × 3 × 5

Prime	12	18	30	Lowest power
2	2²	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
12	15	18	3
12	16	18	2
12	17	18	1
12	18	18	6
12	18	19	1
12	18	20	2
12	18	21	3
12	18	22	2
12	18	23	1
12	18	24	6
12	18	25	1
12	18	26	2
12	18	27	3
12	18	28	2
12	18	29	1
12	18	30	6
12	18	31	1
12	18	32	2
12	18	33	3
12	18	34	2
12	18	35	1
12	18	36	6
12	18	37	1
12	18	38	2
12	18	39	3
12	18	40	2
12	18	41	1
12	18	42	6
12	18	43	1
12	18	44	2

GCF for 12, 18 and 30

What's the Greatest Common Factor (GCF) of 12, 18 and 30?

More with these numbers

Related Calculations

See Also

GCF Table

FAQ

What's the Greatest Common Factor (GCF) of 12, 18 and 30?

What prime factors do 12, 18 and 30 share?

Can you get the GCF of 12, 18 and 30 two numbers at a time?

How does the GCF simplify the ratio 12 : 18 : 30?

See Also

1st	2nd	3rd	GCF
12	15	18	3
12	16	18	2
12	17	18	1
12	18	18	6
12	18	19	1
12	18	20	2
12	18	21	3
12	18	22	2
12	18	23	1
12	18	24	6
12	18	25	1
12	18	26	2
12	18	27	3
12	18	28	2
12	18	29	1
12	18	30	6
12	18	31	1
12	18	32	2
12	18	33	3
12	18	34	2
12	18	35	1
12	18	36	6
12	18	37	1
12	18	38	2
12	18	39	3
12	18	40	2
12	18	41	1
12	18	42	6
12	18	43	1
12	18	44	2

1st	2nd	3rd	GCF
12	15	18	3
12	16	18	2
12	17	18	1
12	18	18	6
12	18	19	1
12	18	20	2
12	18	21	3
12	18	22	2
12	18	23	1
12	18	24	6
12	18	25	1
12	18	26	2
12	18	27	3
12	18	28	2
12	18	29	1
12	18	30	6
12	18	31	1
12	18	32	2
12	18	33	3
12	18	34	2
12	18	35	1
12	18	36	6
12	18	37	1
12	18	38	2
12	18	39	3
12	18	40	2
12	18	41	1
12	18	42	6
12	18	43	1
12	18	44	2

1st	2nd	3rd	GCF
12	15	18	3
12	16	18	2
12	17	18	1
12	18	18	6
12	18	19	1
12	18	20	2
12	18	21	3
12	18	22	2
12	18	23	1
12	18	24	6
12	18	25	1
12	18	26	2
12	18	27	3
12	18	28	2
12	18	29	1
12	18	30	6
12	18	31	1
12	18	32	2
12	18	33	3
12	18	34	2
12	18	35	1
12	18	36	6
12	18	37	1
12	18	38	2
12	18	39	3
12	18	40	2
12	18	41	1
12	18	42	6
12	18	43	1
12	18	44	2