The last set of worksheets deals with commonly encountered fractions, including percentage values. These are values that students should be able to site reduce when they encounter them. Mastering these reducing problems will make many other fraction problems go much faster.
In fact, if you successfully learn a few algebra concepts then you will want to have more. Practice is really important in algebra and you ca not expect to learn everything from online courses or tutorials. You need to go through the concepts and the principles of algebra again and again in order to learn them.