The lowest common denominator would be 24 for these 2 fractions...so change 1/3 into 8/24, and 1/8 into 3/24. Add them together and you see that it took him 11/24 hours to do both assignments. That won’t simplify any, so 11/24 should be your answer.
To answer, we need to add the two fractions. However, to add them, they need to have a common denominator (the number on bottom). One easy way to do this is to multiply both so they are the same number. Use the opposite number! Then, you can add the numbers straight across. You will most likely need to simplify. If you have any further questions, let me know!
