Calebs kayak is 12 3/5 feet long. Ava's kayak is 20 2/5 feet long. How much longer is Ava's kayak?

You can just subtract them seperatly like this:

20-12=8

2/5-3/5 = - 1/5

Since its negative, you have to take 1 off of the final answer and put 4/5 so the answer is 7 4/5

Another way is making it a decimal

12 3/5 = 12.6

20 2/5 = 20.4

20.4-12.6 = 7.8

7.8=7 4/5