Soreno
Try for free
Free tool, no sign-up

Case interview math practice, timed and scored

Ten questions against the clock on percentages, growth rates, break-even, margins and large numbers. You see right or wrong instantly, then your score and average time per question.

Start a timed setSee pricing

Runs in your browser. Nothing you type is saved or sent.

Free drills

Warm up your case math

Mixed or one type at a time. Every answer comes with the shortcut, so you get faster each set.

Set up

A 10-question timed set

Do the math in your head or on paper, type the answer and press Enter. You see right or wrong straight away, then your score and average time per question.

Two questions from each type: percentages, growth rates, break-even, margins and large numbers. Answers within 1% count as correct.

How it works

A set takes about five minutes

Short, timed sets are the fastest way to make case math automatic.

  1. 1

    Pick a type and start

    Choose mixed, or drill one type: percentages, growth rates, break-even, margins or large numbers. A set is 10 questions with a stopwatch on each one.

  2. 2

    Answer fast, then check

    Do the math in your head or on paper and type the number. You see right or wrong at once, with the shortcut that gets there quickly.

  3. 3

    Read your score and speed

    At the end you get your score, your average time per question and a list of what you missed. Repeat the type you were slowest on.

Keep going

Build the skill, then use it in a case

Read the shortcuts, practice market sizing or run a full case out loud.

FAQ's

Frequently Asked Questions

Everything you need to know about Soreno, answered in one place.

Drill the same few calculations until they are automatic: percent of a number, percent change, break-even, margins and big-number multiplication and division. Do short timed sets, check each answer straight away and learn the shortcut when you miss one. This page gives you timed 10-question sets with instant feedback, a score and your average time per question.
Mostly arithmetic and judgment rather than advanced math: percentages and percent change, growth and compounding, break-even and payback, margins and profit, and working with millions and billions. Interviewers watch whether you set up the calculation clearly, keep units straight and sanity check the result.
Aim for accuracy first, then speed. As a rough target, answer these clean questions in under 30 seconds each. In a real case the pace is shaped by how well you set up the problem, so do not sacrifice a clear setup to save seconds.
Paper is fine and mirrors most interviews, where you write your math on a pad. These drills use numbers chosen to be workable by hand. Skip the calculator so the skill you build is the one you need.
No. The questions are generated in your browser from templates written by Soreno, with clean numbers. They are practice for the math skills, not a firm's questions.
No. The drills run entirely in your browser. Your answers, scores and times are not stored or sent anywhere, and you do not need an account.
An answer within 1% of the exact value counts as correct, so rounding is fine. In a real interview, rounding to make the math easy is encouraged as long as you say you are doing it.
Every plan starts with a 7-day free trial that includes 2 mock interviews and 3 drills. After that, plans are $199 a month or $349 a year, and weekly from $64. See the pricing page for details.

Ready for an interviewer that talks back?

Start the 7-day free trial and run your first full case with the AI interviewer today.

Start 7-day free trial