Highest common factor

The highest common factor of two or more numbers is the largest number that is a factor of each.

To find the highest common factor of 60 and 150 we need to find the factors of 60 and the factors of 150.

 

30 is the highest common factor

Knowing how to find the highest common factor is useful for simplifying fractions

For example

60/150

= 60÷30/150÷30

= 2/5