GCF of 121 and 165 (Greatest Common Factor)

"Greatest Common Factor" Calculator
Greatest Common Factor of
and

What is the Greatest Common Divisor of 121 and 165?

Answer

GCF of 121 and 165 is
11

(Eleven)

Finding GCF for 121 and 165 using all factors (divisors) listing

The first method to find GCF for numbers 121 and 165 is to list all factors for both numbers and pick the highest common one:

All factors of 121: 1, 11, 121

All factors of 165: 1, 3, 5, 11, 15, 33, 55, 165

So the Greatest Common Factor for 121 and 165 is 11

Finding GCF for 121 and 165 by Prime Factorization

The second method to find GCF for numbers 121 and 165 is to list all Prime Factors for both numbers and multiply the common ones:

All Prime Factors of 121: 11, 11

All Prime Factors of 165: 3, 5, 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 121 and 165

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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 121 and 165? (The answer is: 11). Select the first number (e.g. '121') and the second number (e.g. '165'). 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
1211501
1211511
1211521
1211531
12115411
1211551
1211561
1211571
1211581
1211591
1211601
1211611
1211621
1211631
1211641
12116511
1211661
1211671
1211681
1211691
1211701
1211711
1211721
1211731
1211741
1211751
12117611
1211771
1211781
1211791

FAQ

What is the Greatest Common Divisor of 121 and 165?

GCF of 121 and 165 is 11

How to find the GCF of 121 and 165?

You can find the GCF of 121 and 165 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 121 and 165 is 11.

What prime factors do 121 and 165 share?

The prime factorizations of 121 and 165 have 11 in common, and multiplying those shared primes gives 11 — exactly the greatest common factor.

How does the GCF reduce the fraction 121/165?

Divide the numerator and the denominator by the GCF 11: 121 ÷ 11 = 11 and 165 ÷ 11 = 15. So 121/165 in lowest terms is 11/15.

See Also