5/6 + 3/8
You can easily put these both into the same denominator by multiplying 5/6 by 4 to get 20/24.
And you can also multiply 3/8 by 3 for 9/24.
Now that you have a common denominator, you can just add both the numbers!
9+20/24
=
29/24
Then you can just add 6*24/24 to the number.