I found one of my 6th grade notebooks (actually a binder of loose leaf paper) with notes from my math class, which used the book Math Thematics: Book 2. Right after an incomplete section of notes on quantiles and box and whisker plots, I found the following pages.
I vaguely recall just thinking of small problems and trying to do them. (Aside from below, another example was trying to solve $n$th-order rate equations from analytic chemistry.)
I haven’t gone through and verified yet, but the last page looks mostly right (two logs and two arctans).