What is the highest common factor of 225 and 270?

To find the highest common factor (HCF) of 225 and 270, we first need to find the factors of each number. The factors of 225 are 1, 3, 5, 9, 15, 25, 45, 75, and 225. The factors of 270 are 1, 2, 3, 5, 6, 9, 10, 15, 18, 27, 30, 45, 54, 90, 135, and 270. The highest common factor of 225 and 270 is 45, as it is the largest factor that both numbers share.