5 1/8-3 2/3
You first need to find the L.C.D. (Lowest Common Denominator), since you can't subtract with different denominators.
The easiest way to do this is to multiply the denominators. 8 X 3 = 24
Let's start with 1/8. The denominator - 8 goes into 24 THREE times. 3 times the numberator - 1 equals 3. So, the first number becomes 5 3/24.
Now, let's work with 2/3. 3 goes into 24 EIGHT times. 8 times 2 equals 16. So the second number becomes 3 16/24.
Now the problem is 5 3/24 - 3 16/24.
Normally, you just subtract the numerators, & solve the problem. BUT you can't subtract 16 from 3 in te numerators, so you need to add to 3/24. You take 1 from 5, which makes it 4. Then you change the 1 to the equivalent we can work with here, which is 24/24. Now we add 24/24 to 3/24 to get 27/24. Now the problem becomes:
4 27/24 - 3 16/24
NOW we can subtract the numerators: 27 - 16 = 11. then we subtract the whole numbers: 4 - 3 = 1
This gives us the answer of: 1 11/24