The highest common factor of 34 and 58?

To find the highest common factor you first need to break the numbers down into their prime factors. In this case 34 and 58 are broken down as follows:

34 = 2x17

58 = 2x29

The next step is to identify any common prime factors. In this case, the only common prime factor is a single 2. Therefore the highest common factor of 34 and 58 is 2.