GCF (HCF) of 30 and 115

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What is the Greatest Common Divisor of 30 and 115?

Answer

GCF (HCF) of 30 and 115 is
5

Common factors: 1, 5

5 divides both: 30 ÷ 5 = 6, 115 ÷ 5 = 23 — and 6 and 23 share no factor but 1, so no larger number divides both.

30 = 2 × 3 × 5

115 = 5 × 23

Prime30115Lowest power
22——
33——
5555
23—23—

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

GCF = 5

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GCF Table

Number 1Number 2GCF
30513
30522
30531
30546
30555
30562
30582
306030
307010
307515
308010
30966
3010010
3010515
3011010
301155
3012030
3013010
3013515
3015030
3017010
3019515
302355
302382
3029010
303055
3033030
3034010
3035010
3040515

FAQ

What is the Greatest Common Divisor of 30 and 115?

GCF (HCF) of 30 and 115 is 5

How to find the GCF of 30 and 115?

You can find the GCF of 30 and 115 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 30 and 115 is 5.

What prime factors do 30 and 115 share?

The prime factorizations of 30 and 115 have 5 in common, and multiplying those shared primes gives 5 — exactly the greatest common factor.

How does the GCF reduce the fraction 30/115?

Divide the numerator and the denominator by the GCF 5: 30 ÷ 5 = 6 and 115 ÷ 5 = 23. So 30/115 in lowest terms is 6/23.

See Also