GCF (HCF) of 55 and 121

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Greatest Common Factor of
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What is the Greatest Common Divisor of 55 and 121?

Answer

GCF (HCF) of 55 and 121 is
11

Common factors: 1, 11

11 divides both: 55 ÷ 11 = 5, 121 ÷ 11 = 11 — and 5 and 11 share no factor but 1, so no larger number divides both.

55 = 5 × 11

121 = 112

Prime55121Lowest power
55——
111111211

— = 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
551061
551071
551081
551091
5511055
551111
551121
551131
551141
551155
551161
551171
551181
551191
551205
5512111
551221
551231
551241
551255
551261
551271
551281
551291
551305
551311
5513211
551331
551341
551355

FAQ

What is the Greatest Common Divisor of 55 and 121?

GCF (HCF) of 55 and 121 is 11

How to find the GCF of 55 and 121?

You can find the GCF of 55 and 121 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 55 and 121 is 11.

What prime factors do 55 and 121 share?

The prime factorizations of 55 and 121 have 11 in common, and multiplying those shared primes gives 11 — exactly the greatest common factor.

How does the GCF reduce the fraction 55/121?

Divide the numerator and the denominator by the GCF 11: 55 ÷ 11 = 5 and 121 ÷ 11 = 11. So 55/121 in lowest terms is 5/11.

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