You can first turn both numbers into a improper fraction so it looks like this: 41/8-11/4.
Then you have to change the denominator so that they are the same, which looks like this: 41/8-22/8.
After, you subtract the numerator and keep the denominator the same, which will then look like this 19/8.
Lastly, you turn your numbers back into a mixed number so it is 2 3/8.