HCF of: -30 and 24

To find the highest common factor (HCF) of -30 and 24, we focus on their absolute values, which are 30 and 24. The factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30, while the factors of 24 are 1, 2, 3, 4, 6, 8, 12, and 24. The largest factor they share is 6, making the HCF of -30 and 24 equal to 6. When calculating HCF, a fun method is to use the "ladder method." Start by dividing both numbers by their smallest common prime factor, and keep going until you can’t divide anymore. In this case, dividing by 2 gives you 15 and 12, and continuing with 3 leads you to the ultimate HCF of 6! You can be a math magician with this technique!