What's 12 1/3 - 8 5/9

7 7/9-6 7/8

So we need to find a common multiple of 3 and 9, this is 9 therefore:

12 3/9 - 8 5/9

This is the same as 4 - 2/9

= 3 7/9

We now need to find a common multiple of 9 and 8, this is 72 therefore:

7 56/72 - 6 63/72

This is the same as 1-7/72

= 65/72