Answer:
We need 2/3 yards more blue fabric.
Explanation:
To find how much more blue fabric than purple fabric, we need to subtract the blue fabric from the purple fabric.
4 1/3 - 3 2/3
We need to borrow from the 4
3 3/3 + 1/3 - 3 2/3
3 4/3 - 3 2/3
2/3
We need 2/3 yards more blue fabric.