GCF (HCF) of 18 and 39

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What is the Greatest Common Divisor of 18 and 39?

Answer

GCF (HCF) of 18 and 39 is
3

Common factors: 1, 3

3 divides both: 18 ÷ 3 = 6, 39 ÷ 3 = 13 — and 6 and 13 share no factor but 1, so no larger number divides both.

18 = 2 × 32

39 = 3 × 13

Prime1839Lowest power
22——
33233
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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GCF Table

Number 1Number 2GCF
18246
18251
18262
18279
18282
18291
18306
18311
18322
18333
18342
18351
183618
18371
18382
18393
18402
18426
18431
18459
18462
18486
18491
18502
185418
18551
18562
18582
18591
18606

FAQ

What is the Greatest Common Divisor of 18 and 39?

GCF (HCF) of 18 and 39 is 3

How to find the GCF of 18 and 39?

You can find the GCF of 18 and 39 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 18 and 39 is 3.

What prime factors do 18 and 39 share?

The prime factorizations of 18 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 18/39?

Divide the numerator and the denominator by the GCF 3: 18 ÷ 3 = 6 and 39 ÷ 3 = 13. So 18/39 in lowest terms is 6/13.

See Also