The greatest common factor (GCF) of 9, 12, and 4 is 1.
To find the GCF, we need to identify the factors of each number:
- Factors of 9: 1, 3, 9
- Factors of 12: 1, 2, 3, 4, 6, 12
- Factors of 4: 1, 2, 4
Next, we look for the common factors among these numbers. The only factor that appears in all three lists is 1. Therefore, the greatest common factor of 9, 12, and 4 is 1. This means there is no larger number that can evenly divide all three numbers.