Case math
The arithmetic a case actually requires, which is narrower than most people fear and less forgiving than they expect. Every worked figure on these pages is recomputed by hand, including the commentary around it, because the error that survives review is almost never a wrong multiplication: it is a correct number with a sentence beside it that says something else.
5 guides.
Case Interview Formulas, With Every Line Recomputed
The eight case interview formulas, each worked on stated inputs and checked by hand, including a published launch breakeven and the one-cent sensitivity.
Case Interview Math 2026: Units, Checks, and Rounding
The operations case math is made of, then the four habits that decide whether the number lands, worked end to end on a route with a factor of two built into it.
Case Interview Math 2026: How to Practice and Get Fast
Case interview math is arithmetic and percentages under time: the topics tested, nine formulas, the shortcuts, six timed exercises with solutions, a plan.
Consulting Math: Every Relation a Case Borrows, Recomputed
Every relation consulting math asks for, mapped and sourced: where each one is tested, which convention decides it, and six of them worked line by line.
Consulting Mental Math Practice: The Calculator Rule
Consulting mental math practice built on one rule: Bain allows a calculator on its digital assessment and rules it out in the interviews. Four-week protocol.