What is the HCFof 18 and 32?

The highest common factor (HCF) of 18 and 32 is 2. To determine this, we can list the factors of each number: the factors of 18 are 1, 2, 3, 6, 9, and 18, while the factors of 32 are 1, 2, 4, 8, 16, and 32. The largest factor that appears in both lists is 2.