I'm using a textbook but in my course the chapters are numbered differently. For example, the book has the following chapters:
- Real Numbers
- Square Roots
- Polynomial in a single variable (they don't say indeterminate!)
- System of Equations
- Fractional Expressions (that is rational fractions)
whereas the first chapter in my course is Real Numbers which contains chapters 1 and 2 of the book, and my chapter 2 is Algebraic Expressions which contain chapters 3 and 7 of the book since they are closely related.
Now there's a problem in doing this in middle school. Doing this at high school is fine but in middle school, students resist changing the order of chapters and see it as a way to make the subject harder for them not the other way. Also they are not rational enough to understand the arguments I give for this.