Hello!
If a painting is 26 feet long, it's 8 and 2/3 yards long.
This is because there is 3 feet in a yard. You would do 26 divided by 3. You would get 8 yards and have 2 feet left. Obviously 2 feet is smaller than a yard, so it'd be 2/3 of a yard. Therefore the answer is 8 and 2/3 yards.
Hope this helped! :)