GCF (HCF) of 55 and 77

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What is the Greatest Common Divisor of 55 and 77?

Answer

GCF (HCF) of 55 and 77 is
11

Common factors: 1, 11

11 divides both: 55 ÷ 11 = 5, 77 ÷ 11 = 7 — and 5 and 7 share no factor but 1, so no larger number divides both.

55 = 5 × 11

77 = 7 × 11

Prime5577Lowest power
55——
7—7—
11111111

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

GCF = 11

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GCF Table

Number 1Number 2GCF
55621
55631
55641
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

FAQ

What is the Greatest Common Divisor of 55 and 77?

GCF (HCF) of 55 and 77 is 11

How to find the GCF of 55 and 77?

You can find the GCF of 55 and 77 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 55 and 77 is 11.

What prime factors do 55 and 77 share?

The prime factorizations of 55 and 77 have 11 in common, and multiplying those shared primes gives 11 — exactly the greatest common factor.

How does the GCF reduce the fraction 55/77?

Divide the numerator and the denominator by the GCF 11: 55 ÷ 11 = 5 and 77 ÷ 11 = 7. So 55/77 in lowest terms is 5/7.

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