YouTipRef Math Gcd
## Python math.gcd() Method
The `math.gcd()` function returns the greatest common divisor of two integers.
### Syntax
```python
math.gcd(a, b)
### Parameters
* `a` - integer
* `b` - integer
### Return Value
Returns an integer representing the greatest common divisor of `a` and `b`.
### Example
```python
import math
print(math.gcd(6, 9))
# Output: 3
print(math.gcd(12, 18))
# Output: 6
print(math.gcd(17, 13))
# Output: 1
### Note
This function is available in Python 3.5 and above. For older versions, you can use the `fractions.gcd()` function from the `fractions` module.
```python
from fractions import gcd
print(gcd(6, 9))
# Output: 3
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