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Case Maths and Market Sizing

Case maths you can do fast and out loud: a timed baseline, daily drills, percentages and growth rates, break-even and margins, market sizing from top down and bottom up, and sanity checks that catch the dropped zero.

Free · Mac (Apple silicon) and Windows · v1.0.0 · Other platforms

Then open the Marketplace in the app, search for Case Maths and Market Sizing, and click Install. It goes into your own files, and works offline from then on.

What it installs.

1

Pillar

1

Area

50

Projects

204

Starter tasks

📋 Management Consulting

Case Maths and Market Sizing

Building speed with case maths: mental arithmetic, percentages and growth rates, estimation, market sizing logic and sanity checks under pressure.

  1. Timed case maths baseline test
  2. Interview maths rules by firm and round
  3. Multiplication tables to 25 and squares to 30
  4. Fraction to percentage conversion sheet
  5. Zeros, units and scientific notation discipline
  6. Reference numbers worth memorising
  7. Case maths error log set-up
  8. Paper layout for case calculations
  9. Choosing a drill tool and question bank
  10. Daily ten-minute mental maths drill
  11. Commute estimation habit
  12. Weekly market sizing out loud
  13. Weekly error log review
  14. Monthly baseline retest
  15. Reference numbers flashcard refresh
  16. Maths swap sessions with a case partner
  17. Recomputing numbers from the business press
  18. Percent, percentage points and basis points
  19. Growth rates, CAGR and the rule of 72
  20. Division by awkward numbers
  21. Rounding strategy and tracking approximation error
  22. Weighted averages and mix effects
  23. Margin, markup and profit maths without confusion
  24. Break-even and payback calculations
  25. Present value and perpetuity shortcuts for cases
  26. Top-down and bottom-up sizing of the same market
  27. Segmentation trees for market sizing
  28. Supply-side sizing from capacity and outlets
  29. Stock versus flow and replacement cycle sizing
  30. Sizing business-to-business markets
  31. Sizing a product that does not exist yet
  32. Sanity checks and triangulation routine
  33. Stating and defending assumptions out loud
  34. Mental maths shortcuts worth keeping
  35. Narrating calculations without losing the interviewer
  36. Calm maths under pressure plan
  37. Six-week case maths speed programme
  38. Maths-heavy mock with an experienced interviewer
  39. Three-case maths stress evening
  40. Interview day maths warm-up
  41. Final week maths taper
  42. Maths refresher for humanities and arts students
  43. Rebuilding mental maths after years of spreadsheets
  44. Practising case maths around a full-time job
  45. Numbers aloud in English for non-native speakers
  46. Running a case maths session for your club
  47. Range estimates and simple sensitivity
  48. Your own market sizing case bank
  49. Back-of-envelope sizing on a live engagement
  50. Marking other candidates' case maths

Where it starts.

Each project arrives with its purpose, milestones and first tasks written out. Here is how the first three read.

Timed case maths baseline test

Before practising anything, find out where you actually lose time: multiplication with zeros, division by awkward numbers, percentage changes or keeping track of units. A twenty-question timed test, taken once without a calculator and marked honestly, turns vague worry into a list of the three skills to fix first.

First tasks

  • Ask the agent to draft twenty mixed case maths questions with answers kept separate
  • Take the test with a stopwatch, paper and no calculator
  • Mark it and record seconds per question by type
  • Write down your three slowest question types and a target time

Interview maths rules by firm and round

Firms differ on whether you may use a calculator, how much paper you get and whether the maths comes in a live case, a written case or a numerical test. Knowing the rules for each firm on your list stops you practising the wrong way, for example on a phone calculator when the round you face is paper only.

First tasks

  • List your target firms and the rounds each one runs
  • Read each firm's careers page for calculator and test rules
  • Ask one candidate from this year's cycle how the maths was set
  • Note the strictest conditions and practise under them from now on

Multiplication tables to 25 and squares to 30

Most case arithmetic collapses into a handful of products: 12 times 15, 18 times 25, 24 squared. Knowing tables to 25 and squares to 30 by heart removes the slowest step from almost every calculation and frees attention for the logic, which is what the interviewer is actually scoring.

First tasks

  • Write out the 11 to 25 tables once by hand on a single sheet
  • Make flashcards for the products you hesitate on
  • Learn squares from 11 to 30 in blocks of five
  • Time yourself on fifty random products and log the result

Make it yours.

Install Case Maths and Market Sizing, then tell Aurum the date you're aiming for. It checks whether the plan fits the weeks you actually have.

Free · Mac (Apple silicon) and Windows · v1.0.0 · Other platforms

Blueprints are general information to help you organise your own work. They are not medical, financial, legal or other professional advice. See the Terms.