In pre-calculus? Easy. Matrices, including Gauss-Jordan Elimination as an algorithm for solving systems of linear equations. Started that topic today.
If students' ability to learn were proportional to my excitement in teaching the material, they'd all be matrix gurus.
One of the more fun math courses that I had was group theory in grad school (chemistry). It was all or mostly matrices. And if memory serves me right, a lot more understandable than calculus. (I still don't know how I managed 3 college courses in it.) GRIN.
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