For teachers

Answer keys

Every auto-graded question in the course, with the answer and the one line of reasoning behind it. Print this and mark from paper.

These are read from the students' own pages, not typed out. Every answer here is produced by the same model that marks the student, at the moment you open this page. That is deliberate: a key typed into a document would be wrong the first time a figure was tuned, and neither of us would notice. If the course changes, this changes with it.

Reading the module pages…

A note on the arithmetic: the model compounds monthly, so $500 at 5% over 20 years is $1,356 rather than the $1,327 you get from 1.05²⁰. If a student checks you with an annual figure, they are not wrong about the method, only about the convention. It is stated on the pages that carry a rate.

Back to the teacher page

Written answers are not here and cannot be. The four questions at the end of a run and the reflections in each part have no correct answer, which is the point of asking them. The four-point scale on the teacher page is for those.