The highest common factor (HCF) of 24 and 60 is 12.
To find the HCF, we can start by determining the factors of each number. The factors of 24 are 1, 2, 3, 4, 6, 8, 12, and 24. The factors of 60 are 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, and 60.
Next, we look for the common factors between the two sets. The common factors are 1, 2, 3, 4, 6, and 12. Among these, the highest one is 12. Thus, the highest common factor of 24 and 60 is 12.