# What is GCF for 9 and 13?

GCF of

Observe that they have nothing in common.

These numbers are referred to as relatively primes or coprimes.

By signing up, you agree to our Terms of Service and Privacy Policy

So GCF (greatest common factor) is 1

Using prime numbers as factors: also including 1

The only common factor is 1

So GCF (greatest common factor) is 1

By signing up, you agree to our Terms of Service and Privacy Policy

The greatest common factor (GCF) of 9 and 13 is 1.

By signing up, you agree to our Terms of Service and Privacy Policy

- 98% accuracy study help
- Covers math, physics, chemistry, biology, and more
- Step-by-step, in-depth guides
- Readily available 24/7