GCF (HCF) of 55 and 80

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What is the Greatest Common Divisor of 55 and 80?

Answer

GCF (HCF) of 55 and 80 is
5

Common factors: 1, 5

5 divides both: 55 ÷ 5 = 11, 80 ÷ 5 = 16 — and 11 and 16 share no factor but 1, so no larger number divides both.

55 = 5 × 11

80 = 24 × 5

Prime5580Lowest power
2—24—
5555
1111——

— = 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
55655
556611
55671
55681
55691
55705
55711
55721
55731
55741
55755
55761
557711
55781
55791
55805
55811
55821
55831
55841
55855
55861
55871
558811
55891
55905
55911
55921
55931
55941

FAQ

What is the Greatest Common Divisor of 55 and 80?

GCF (HCF) of 55 and 80 is 5

How to find the GCF of 55 and 80?

You can find the GCF of 55 and 80 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 55 and 80 is 5.

What prime factors do 55 and 80 share?

The prime factorizations of 55 and 80 have 5 in common, and multiplying those shared primes gives 5 — exactly the greatest common factor.

How does the GCF reduce the fraction 55/80?

Divide the numerator and the denominator by the GCF 5: 55 ÷ 5 = 11 and 80 ÷ 5 = 16. So 55/80 in lowest terms is 11/16.

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