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Case Interview Math Drill

Free Math Practice Tool

Use this free case interview math drill to train formulas, mental math, units, and business interpretation with AI feedback.

Fast answer

Case interview math drill: what to know

  • This free case interview math drill gives you one timed AI-graded math rep.
  • Strong answers show the formula, staged calculation, units, and final number.
  • Always translate the number into business meaning before you stop.

The quick version: A case interview math drill is a timed rep where you set up the equation, calculate without a calculator, carry units, and explain what the number means for the client.

Start a free case math drill

One timed rep with speech-to-text and AI feedback.

Why case interview math drills matter

Case math is not just arithmetic. Interviewers are listening for setup, pacing, communication, and sanity checks. A separate math drill lets you practice those moves without spending thirty minutes on a full case first.

How the case interview math drill works

Read the prompt, write the formula, compute in steps, and state the answer with units. The AI feedback checks the equation, arithmetic, interpretation, and communication quality.

View example answers

Math drill examples

These are the common shapes behind most consulting math prompts.

  • Example 1

    Revenue goes from $80M to $104M. What is the growth rate?

    Approach

    Growth = change divided by original value. The change is $24M. $24M divided by $80M equals 30%.

    Answer

    Revenue grew by 30%.

  • Example 2

    A product sells for $50 and costs $30. What is contribution margin?

    Approach

    Contribution margin per unit is $20. Contribution margin percentage is $20 divided by $50.

    Answer

    The product has a 40% contribution margin.

  • Example 3

    A market has 2M buyers spending $200 per year. What is annual spend?

    Approach

    Multiply buyers by annual spend per buyer, then check the unit.

    Answer

    Annual spend is $400M.

What math drills should build

Use math drills to train the repeatable habits: formula first, staged calculation, units throughout, and a quick sanity check. Speed matters, but clean setup matters more because it prevents one small arithmetic slip from derailing the whole case.

View common mistakes

Common math drill mistakes

These mistakes make correct numbers feel unreliable.

  • Skipping the formula
    Say the formula before substituting numbers. It makes the answer easier to follow and easier to debug.
  • Dropping units
    Carry dollars, customers, units, or years through the calculation.
  • Stopping at the number
    Explain whether the number is large, small, attractive, risky, or worth testing next.

Frequently asked questions

  • Is this different from the math practice article?

    Yes. The article teaches the method. This page gives you a live AI-graded rep for the math drill type.

  • Do I need a calculator?

    No. Case interview math should be practiced with simple mental math and clear rounding.

  • Where do I continue after signup?

    The signup CTA sends you to the authenticated math drill room so the next rep is in context.

After your free rep

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