GCF (HCF) of 18 and 80

"Greatest Common Factor" Calculator
Greatest Common Factor of
and

What is the Greatest Common Divisor of 18 and 80?

Answer

GCF (HCF) of 18 and 80 is
2

Common factors: 1, 2

2 divides both: 18 ÷ 2 = 9, 80 ÷ 2 = 40 — and 9 and 40 share no factor but 1, so no larger number divides both.

18 = 2 × 32

80 = 24 × 5

Prime1880Lowest power
22242
332——
5—5—

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

GCF = 2

More with these numbers

Related Calculations

See Also

GCF Table

Number 1Number 2GCF
18462
18486
18491
18502
185418
18551
18562
18582
18591
18606
18639
18642
18666
18702
187218
18753
18786
18802
18819
18846
18882
18966
18999
181002
1810818
181122
181206
181302
182259
182502

FAQ

What is the Greatest Common Divisor of 18 and 80?

GCF (HCF) of 18 and 80 is 2

How to find the GCF of 18 and 80?

You can find the GCF of 18 and 80 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 18 and 80 is 2.

What prime factors do 18 and 80 share?

The prime factorizations of 18 and 80 have 2 in common, and multiplying those shared primes gives 2 — exactly the greatest common factor.

How does the GCF reduce the fraction 18/80?

Divide the numerator and the denominator by the GCF 2: 18 ÷ 2 = 9 and 80 ÷ 2 = 40. So 18/80 in lowest terms is 9/40.

See Also