Quick maths
Ten timed questions on raw arithmetic: big multiplications, percentages and fractions.
152 drills · 4 skills · 2 daily warm-ups
Ten timed questions, new numbers every day. Five minutes before anything else.
Ten timed questions on raw arithmetic: big multiplications, percentages and fractions.
Ten timed questions in the sentences an interviewer says: growth, breakeven, margin and share.
Fast, accurate arithmetic on the numbers a case throws at you.
Percent change, points versus percent, reverse percentages and weighted mixes: the arithmetic under every case.
Revenue as price times volume, compounding, CAGR and the rule of 72, and splitting growth into its drivers.
Gross, operating and contribution margin, margin moves in points, and what a cost or price change does to profit.
Breakeven volume, price and market share, payback periods, and the volume you need to justify a price cut.
ROI, NPV, perpetuities and valuation multiples, and how to pick between two investments.
Structure the case types interviewers set most often.
Find out why profit moved by splitting it cleanly, segmenting early and asking the question that localises the problem.
Decide whether a client should enter a market, and how, with a structure that ends in a go or no-go.
Structure where growth will come from, and judge whether a new product deserves the investment.
Find where the cost sits, read benchmarks with care, and separate quick wins from structural change.
Size markets and read exhibits the way a consultant does.
Read a chart fast, pull out the number that matters and avoid the tempting wrong conclusion.
Find the insight in a dense table: margins, shares and the segment driving the change.
Clarify, brainstorm and close with a clear recommendation.
Ask the few questions that change your structure: objective, scope, metric, timeframe and constraints.
Brainstorm ways to grow revenue in clear buckets, then say which ideas you would pursue first.
Find cost levers and operational fixes in a structure the interviewer can follow, then point to where the money is.
Name what could sink your recommendation, how to de-risk it and what you would analyse next.
Give the CEO a 60-second recommendation: answer first, three reasons with numbers, risks and next steps.
Usually not. McKinsey and Bain interviews expect you to do the maths on paper, so practise without one. Some online tests, such as McKinsey's Red Rock Study and Bain's SOVA, do give you a calculator.
The estimation drill trains the order-of-magnitude sizing that market sizing questions rely on. For a full market sizing case with an interviewer, try Sizing the UK ready-meal market in the case library.
The two maths warm-ups generate new numbers every time, so you can do them daily without memorising answers. The curriculum drills are fixed, so you can work through each topic, see what you got wrong and come back to it.
Frameworks for the common case types, market sizing, reading charts and tables, clarifying questions, brainstorming and the final recommendation. Written drills get AI feedback against a rubric when you are signed in, and a model answer to mark yourself against when you are not.
Ready for a full case? Practise one with the AI interviewer.
Percent change, points versus percent, reverse percentages and weighted mixes: the arithmetic under every case.
Revenue as price times volume, compounding, CAGR and the rule of 72, and splitting growth into its drivers.
Gross, operating and contribution margin, margin moves in points, and what a cost or price change does to profit.
Breakeven volume, price and market share, payback periods, and the volume you need to justify a price cut.
ROI, NPV, perpetuities and valuation multiples, and how to pick between two investments.
Find out why profit moved by splitting it cleanly, segmenting early and asking the question that localises the problem.
Decide whether a client should enter a market, and how, with a structure that ends in a go or no-go.
Structure where growth will come from, and judge whether a new product deserves the investment.
Judge whether a deal creates value: rationale, standalone value, synergies, price and risk.
Set a price using cost, competitors and customer value, and know which one should anchor it.
Find where the cost sits, read benchmarks with care, and separate quick wins from structural change.
Size a market from the population down, one defensible assumption at a time.
Build a market from the supply side: capacity, utilisation and price.
Read a chart fast, pull out the number that matters and avoid the tempting wrong conclusion.
Find the insight in a dense table: margins, shares and the segment driving the change.
Ask the few questions that change your structure: objective, scope, metric, timeframe and constraints.
Brainstorm ways to grow revenue in clear buckets, then say which ideas you would pursue first.
Find cost levers and operational fixes in a structure the interviewer can follow, then point to where the money is.
Name what could sink your recommendation, how to de-risk it and what you would analyse next.
Give the CEO a 60-second recommendation: answer first, three reasons with numbers, risks and next steps.