What are the highest common factors of 108 and 270?

The highest common factor (HCF) of two numbers is the largest number that divides both of them without leaving a remainder. To find the HCF of 108 and 270, we first need to find the factors of each number. The factors of 108 are 1, 2, 3, 4, 6, 9, 12, 18, 27, 36, 54, and 108. 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 108 and 270 is 54.