GCF (HCF) of 2 and 18

"Greatest Common Factor" Calculator

What is the Greatest Common Divisor of 2 and 18?

Answer

GCF (HCF) of 2 and 18 is

Common factors: 1, 2

2 divides 18 (18 ÷ 2 = 9), so the GCF is the smaller number itself.

2 — prime

18 = 2 × 3²

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

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

GCF = 2

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Related Calculations

GCF Table

Number 1	Number 2	GCF
2	1	1
2	3	1
2	4	2
2	5	1
2	6	2
2	7	1
2	8	2
2	9	1
2	10	2
2	12	2
2	13	1
2	14	2
2	15	1
2	18	2
2	20	2
2	21	1
2	22	2
2	24	2
2	25	1
2	26	2
2	27	1
2	28	2
2	30	2
2	31	1
2	34	2
2	36	2
2	41	1
2	43	1
2	48	2
2	49	1

FAQ

What is the Greatest Common Divisor of 2 and 18?

GCF (HCF) of 2 and 18 is 2

How to find the GCF of 2 and 18?

You can find the GCF of 2 and 18 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 2 and 18 is 2.

What prime factors do 2 and 18 share?

The prime factorizations of 2 and 18 have 2 in common, and multiplying those shared primes gives 2 — exactly the greatest common factor.

How does the GCF reduce the fraction 2/18?

Divide the numerator and the denominator by the GCF 2: 2 ÷ 2 = 1 and 18 ÷ 2 = 9. So 2/18 in lowest terms is 1/9.

GCF (HCF) of 2 and 18

What is the Greatest Common Divisor of 2 and 18?

More with these numbers

Related Calculations

See Also

GCF Table

FAQ

What is the Greatest Common Divisor of 2 and 18?

How to find the GCF of 2 and 18?

What prime factors do 2 and 18 share?

How does the GCF reduce the fraction 2/18?

See Also

Number 1	Number 2	GCF
2	1	1
2	3	1
2	4	2
2	5	1
2	6	2
2	7	1
2	8	2
2	9	1
2	10	2
2	12	2
2	13	1
2	14	2
2	15	1
2	18	2
2	20	2
2	21	1
2	22	2
2	24	2
2	25	1
2	26	2
2	27	1
2	28	2
2	30	2
2	31	1
2	34	2
2	36	2
2	41	1
2	43	1
2	48	2
2	49	1

Number 1	Number 2	GCF
2	1	1
2	3	1
2	4	2
2	5	1
2	6	2
2	7	1
2	8	2
2	9	1
2	10	2
2	12	2
2	13	1
2	14	2
2	15	1
2	18	2
2	20	2
2	21	1
2	22	2
2	24	2
2	25	1
2	26	2
2	27	1
2	28	2
2	30	2
2	31	1
2	34	2
2	36	2
2	41	1
2	43	1
2	48	2
2	49	1

Number 1	Number 2	GCF
2	1	1
2	3	1
2	4	2
2	5	1
2	6	2
2	7	1
2	8	2
2	9	1
2	10	2
2	12	2
2	13	1
2	14	2
2	15	1
2	18	2
2	20	2
2	21	1
2	22	2
2	24	2
2	25	1
2	26	2
2	27	1
2	28	2
2	30	2
2	31	1
2	34	2
2	36	2
2	41	1
2	43	1
2	48	2
2	49	1