The greatest common factor (GCF) of 15, 30, and 60 is 15.
To find the GCF, we need to determine the factors of each number:
- Factors of 15: 1, 3, 5, 15
- Factors of 30: 1, 2, 3, 5, 6, 10, 15, 30
- Factors of 60: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
Next, we identify the common factors between these sets:
- Common factors: 1, 3, 5, 15
The largest of these common factors is 15, which makes it the greatest common factor for the numbers 15, 30, and 60.