GCF (HCF) of 121 and 165

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What is the Greatest Common Divisor of 121 and 165?

Answer

GCF (HCF) of 121 and 165 is
11

Common factors: 1, 11

11 divides both: 121 ÷ 11 = 11, 165 ÷ 11 = 15 — and 11 and 15 share no factor but 1, so no larger number divides both.

121 = 112

165 = 3 × 5 × 11

Prime121165Lowest power
3—3—
5—5—
111121111

— = 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
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 (HCF) 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