Guides

Math and quant

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Math and quant
Michigan Ross Case Book: 14 Cases and Formula Guide
Inside the 14-case 2019 Michigan Ross case book: its formula primer, industry primers, and a source-backed American Bank ATM profitability example.
Math and quant
Numerical Reasoning Test for Consulting 2026: Format & Prep
Which provider you will face, question types and weighting, the score consulting firms want, mental-math hacks.
Math and quant
NPV and Discounting in Case Interviews: Shortcut Guide 2026
Handle NPV and discounting in case interviews fast: the perpetuity shortcut (CF / r), the 10% default rate, no-calculator mental math.
Math and quant
Market Sizing Practice Questions and Solutions (2026)
Practice market sizing with a live AI-graded question, worked solutions, a reference-number cheat sheet, sanity checks, and a two-week drill plan.
Math and quant
Best Free AI for Case Math Practice + Live Graded Drill
Compare five free AI tools for case math practice, then run a live graded drill. Includes worked examples, copy-paste prompts, and mental-math shortcuts.
Math and quant
Case Interview Math Tips: A Calm, Repeatable Process (2026)
Twelve case interview math tips: the four-step Verbalize-Calculate-Sense-check-Interpret loop, the round-first rule, unit tagging.
Math and quant
Finance Case Interview Guide: NPV, WACC, and Corporate Decision Math (2026)
Corporate finance cases: NPV vs IRR, WACC, working capital, and a worked capex mini-case. This is decision math, not a bank or a fintech.
Math and quant
Market Sizing Questions: What They Are Testing (and What They Are Not)
Market-sizing questions test a chain with units, not a memorized TAM. Types of prompts, a cement-bags-in-Kenya sketch, and how this differs from a full size.
Math and quant
Break-Even in Case Interviews: Units, Cash, and When to Stop
Set up break-even with units attached: contribution per unit, fixed cost, and the volume that makes the project cash-neutral. Worked example: a district hospital MRI.
Math and quant
ZS Associates Case Interview: Pharma Commercial Analytics (2026)
ZS interviews are data-heavy pharma and medtech commercial cases: targeting, promotion response, sales-force sizing. Worked specialty-drug example and McKinsey-trained mistakes.
Math and quant
Consulting Math Formulas: Units on Every Line
The case-room formulas with units: contribution, break-even, CAGR, margin, growth, and capacity. Worked example: a cement kiln’s annual tonnes.
Math and quant
Case Math Shortcuts: Round Where It Is Cheap, Not Where It Is Easy
A partner's price list for case math shortcuts: what rounding costs in a product, a division, and a margin, with a break-even example you can reproduce.