Good point Polar Bear. Oregon is in the middle of an education crisis, so our example may not be a good one. And our district may differ as well. When ds was working on pre-algebra the last few months of 5th grade, it turned out the book was more of an intro to algebra. The pre-algebra used by the middle school is more of a geometry primer.

When I was in school ( when the dinosaurs roamed) we had no pre-algebra. We did Algebra 1, Algebra 2, Geometry and then onto trig. I'm fairly sure calculus was only a college class.