The greatest common factor (GCF) of 4 and 18 is 2.
To find the GCF, we can list the factors of each number:
- Factors of 4: 1, 2, 4
- Factors of 18: 1, 2, 3, 6, 9, 18
Next, we identify the common factors in both lists:
- Common factors: 1, 2
The largest of these common factors is 2, which is the GCF of 4 and 18.