GCF of 55 and 121 (Greatest Common Factor)

"Greatest Common Factor" Calculator
Greatest Common Factor of
and

What is the Greatest Common Divisor of 55 and 121?

Answer

GCF of 55 and 121 is
11

(Eleven)

Finding GCF for 55 and 121 using all factors (divisors) listing

The first method to find GCF for numbers 55 and 121 is to list all factors for both numbers and pick the highest common one:

All factors of 55: 1, 5, 11, 55

All factors of 121: 1, 11, 121

So the Greatest Common Factor for 55 and 121 is 11

Finding GCF for 55 and 121 by Prime Factorization

The second method to find GCF for numbers 55 and 121 is to list all Prime Factors for both numbers and multiply the common ones:

All Prime Factors of 55: 5, 11

All Prime Factors of 121: 11, 11

As we can see there is only one Prime Factor common to both numbers. It is 11

So 11 is the Greatest Common Factor of 55 and 121

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About "Greatest Common Factor" Calculator

This calculator will help you find the greatest common factor (GCF) of two numbers. For example, it can help you find out what is the Greatest Common Divisor of 55 and 121? (The answer is: 11). Select the first number (e.g. '55') and the second number (e.g. '121'). After that hit the 'Calculate' button.
Greatest Common Factor (GCF) also known as the Greatest Common Divisor (GCD) or Highest Common Factor (HCF) - it is the largest positive integer that divides each of the integers with zero remainder.
"Greatest Common Factor" Calculator
Greatest Common Factor of
and

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 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.

See Also