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GCF (HCF) of 33 and 39

"Greatest Common Factor" Calculator

What is the Greatest Common Divisor of 33 and 39?

Answer

GCF (HCF) of 33 and 39 is

3

Common factors: 1, 3

3 divides both: 33 ÷ 3 = 11, 39 ÷ 3 = 13 — and 11 and 13 share no factor but 1, so no larger number divides both.

33 = 3 × 11

39 = 3 × 13

Prime	33	39	Lowest power
3	3	3	3
11	11	—	—
13	—	13	—

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

GCF = 3

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See Also

Least Common Multiple - Find the Least Common Multiple (LCM) of two numbers
Greatest Common Factor of 3 Numbers - Find the Greatest Common Factor (GCF) of three numbers
Least Common Multiple of 3 Numbers - Find the Least Common Multiple (LCM) of three numbers

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What is the GCF (HCF) of 33 and 39. The GCF of 33 and 39 is 3 — the biggest number that can divide both integers. Step-by-step GCF (GCD) calculation by factoring.

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GCF Table

Number 1	Number 2	GCF
33	36	3
33	37	1
33	39	3
33	40	1
33	42	3
33	43	1
33	44	11
33	45	3
33	46	1
33	47	1
33	49	1
33	51	3
33	53	1
33	54	3
33	55	11
33	56	1
33	57	3
33	60	3
33	77	11
33	121	11

FAQ

What is the Greatest Common Divisor of 33 and 39?

GCF (HCF) of 33 and 39 is 3

How to find the GCF of 33 and 39?

You can find the GCF of 33 and 39 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 33 and 39 is 3.

What prime factors do 33 and 39 share?

The prime factorizations of 33 and 39 have 3 in common, and multiplying those shared primes gives 3 — exactly the greatest common factor.

How does the GCF reduce the fraction 33/39?

Divide the numerator and the denominator by the GCF 3: 33 ÷ 3 = 11 and 39 ÷ 3 = 13. So 33/39 in lowest terms is 11/13.