Case Math and Market Sizing
FreeMediumManagement Consulted
Played through YouTube’s official embed player. Prefer the full site? Watch 3 Case Interview Math Mistakes That Cost You the McKinsey Offer on YouTube · Management Consulted
Three case math mistakes that quietly cost offers: losing the units, skipping the sanity check, and computing what was never asked. Each one is a habit problem, and this video pairs each with its correction.
Watching is the first half. The second half is doing it yourself while the patterns are still in your head.
Member comments open here with the Community launch. Until then, take your questions about this video to Richard on the home page, or bring them to your next practice session.
Free
EasyCase Math and Market Sizing
Hacking the Case Interview · on YouTube
The shortest honest route into market sizing: the structure, the assumptions, and the difference between TAM, SAM, and SOM. Seven minutes that make every longer sizing video easier to follow.
Free
MediumCase Math and Market Sizing
Management Consulted · on YouTube
A step-by-step sizing walkthrough in the McKinsey manner, from the first clarifying question to the sanity check at the end. Note how every assumption is said out loud before it is used.
Free
MediumCase Math and Market Sizing
Management Consulted · on YouTube
A Bain-style sizing framework built live, with the interviewer assessing the framework itself at the end. Useful for seeing how much of the grade sits in the structure rather than the arithmetic.
Free
EasyCase Math and Market Sizing
MissAngieLu · on YouTube
A four-step method for sizing anything, demonstrated on the croissants sold in Paris with an issue tree and openly stated assumptions. A good second angle if the formula-first approach has not clicked yet.
Free
MediumCase Math and Market Sizing
Hacking the Case Interview · on YouTube
The shortcuts that keep case math clean without a calculator: friendly numbers, doubling and halving, and cancelling zeros before you divide. Pair the techniques here with timed drills until they are reflexes.
Free
EasyCase Math and Market Sizing
rocketblocks · on YouTube
RocketBlocks on the factoring techniques that turn ugly divisions into two easy ones, applied to the numerator, the denominator, or both. Short and mechanical, which is exactly what mental math practice should be.
Free
EasyCase Math and Market Sizing
Management Consulted · on YouTube
An ex-Bain consultant explains how to prepare for case math with drills, and why the business insight at the end of a calculation matters more than the calculation itself. Watch it once, then go and drill.
Free
EasyCase Math and Market Sizing
Hacking the Case Interview · on YouTube
A full beginner tutorial on market sizing, from choosing a segmentation to stating assumptions out loud and sanity checking the final number. Work through it with paper in hand before you time yourself on the drill bank.
Free
EasyCase Math and Market Sizing
Hacking the Case Interview · on YouTube
A kit of arithmetic shortcuts for case math: rounding with intent, splitting hard multiplications, and keeping percentages clean without a calculator. Pair each trick with timed drills until the shortcut is faster than the long way.
Free
EasyCase Math and Market Sizing
CraftingCases · on YouTube
Estimation questions punish slow arithmetic more than wrong answers, and this lesson is about speed with structure: round, decompose, and keep the units attached. Drill the method on our sizing bank until the pace feels boring.
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HardCase Math and Market Sizing
CraftingCases · on YouTube
A hard market sizing example worked as a live exchange between an ex-Bain interviewer and an ex-McKinsey candidate, with the breakdown after. Watch where the segmentation choice is made, because the whole estimate hangs on it.
Free
EasyCase Math and Market Sizing
CraftingCases · on YouTube
A beginner market sizing example taken slowly, with every step narrated and every assumption said out loud. The right first sizing video if the method in Level 4 still feels abstract when you try it alone.
Free
MediumCase Math and Market Sizing
CraftingCases · on YouTube
The single most expensive mistake in quantitative case questions, named and demonstrated: it is not arithmetic, and it happens before the first number is computed. A short watch that will change how you read every exhibit.
Free
MediumCase Math and Market Sizing
My Consulting Offer · on YouTube
Case interview math comes in four types of problems, and each has its own preparation. This video maps the four and shows what mastery of each looks like before you face them under time pressure.
I am Richard, your interviewer here. I run cases with you, drill your math, and tell you plainly which part of your game needs work. Ask me something, or press Hear it and I will introduce myself out loud in your device voice. The studio voice connects at launch.
He answers from the guide's own content, names the level it lives in, and does not invent firm facts. On member accounts he remembers your year, school, progress, and scores; you can see and clear what he remembers.
