Frozen, all-green versions of the Lesson 1 exercises — the same workbenches with the answer filled in, plus the reasoning behind each number. Try the drill first; the surprise is the lesson.
- 🟢 Predict the totals — the six totals worked fact by fact, and why the grand total falls out both ways.
- 🟡 Build the pivot — the one grouping line that lights up cells, totals and grand total at once.
- 🔴 The growth trap — why portfolio growth is 7.74 %, not the 11.81 % you get by averaging the parts.