GCF (HCF) of 30 and 38

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What is the Greatest Common Divisor of 30 and 38?

Answer

GCF (HCF) of 30 and 38 is
2

Common factors: 1, 2

2 divides both: 30 ÷ 2 = 15, 38 ÷ 2 = 19 — and 15 and 19 share no factor but 1, so no larger number divides both.

30 = 2 × 3 × 5

38 = 2 × 19

Prime3038Lowest power
2222
33——
55——
19—19—

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

GCF = 2

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GCF Table

Number 1Number 2GCF
30322
30342
30355
30366
30382
30393
304010
30426
30431
30442
304515
30486
30491
305010
30513
30522
30531
30546
30555
30562
30582
306030
307010
307515
308010
30966
3010010
3010515
3011010
301155

FAQ

What is the Greatest Common Divisor of 30 and 38?

GCF (HCF) of 30 and 38 is 2

How to find the GCF of 30 and 38?

You can find the GCF of 30 and 38 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 30 and 38 is 2.

What prime factors do 30 and 38 share?

The prime factorizations of 30 and 38 have 2 in common, and multiplying those shared primes gives 2 — exactly the greatest common factor.

How does the GCF reduce the fraction 30/38?

Divide the numerator and the denominator by the GCF 2: 30 ÷ 2 = 15 and 38 ÷ 2 = 19. So 30/38 in lowest terms is 15/19.

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