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Top 50 mental math Interview Questions

The most frequently asked mental math questions across all roles and companies, ranked by real interview frequency. Updated daily.

50questions
~8htotal time
192companies covered
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1
Behavioral & LeadershipStart here. 8 questions · ~75 min
Correcting a Simple Analytical MistakeEasy
Recently asked

Tests ownership and communication when correcting an avoidable analytical error under time pressure.

mental mathtechnicalquantitative problem solvingBeta TechnologiesMcAfeeNBCUniversal
Handling Pressure in Mental MathEasy
Recently asked

Tests quantitative problem solving under pressure, plus communication, recovery from mistakes, and self-awareness.

time managementmental mathquantitative problem solvingCircle KIntercontinental Exchange HoldingsSusquehanna International Group
Explaining Fast Mental MathEasy

Tests quantitative problem solving under pressure, plus communication and judgment in explaining a fast mental calculation clearly.

currency conversionmental mathquantitative problem solvingKoch Minerals & TradingSSigSusquehanna International Group
Explaining a Simple Math MissEasy

Tests ownership and communication after a basic quantitative error, including how you recover trust and improve your process.

brain teasermental mathlogical deductionSusquehanna International Group
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2
Statistics & Probability29 questions · ~271 min
Bucket Expected GainMedium
Recently asked

Calculate the expected gain when two balls are thrown uniformly into three one-space buckets with overflow penalties.

probabilitymental mathExpected ValueJane Street
Simple Percentage CalculationEasy

Compute 15% of 300 using basic percentage arithmetic.

mental mathpercentagesarithmeticathenahealthCobblestone Energy
Numerical Calculation and SolvingMedium
Recently asked

Explain how you solve difficult numerical questions accurately and efficiently under interview conditions.

statistics fundamentalsmental mathmathematical reasoningCapital One
Steady State of a Markov ChainHard
Recently asked

Find the stationary distribution of a two-state Markov chain mentally using balance equations and normalization.

linear algebraprobabilitymental mathJane Street
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3
Metrics3 questions · ~28 min
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4
Strategy4 questions · ~37 min
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5
More topics6 questions · ~56 min
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Camel Banana Case StudyMedium
Practice
Recently asked
Practice drill

Calculate bananas remaining after each transport stage using joins, conditional trip counts, and aggregation.

Data ManipulationProblem Solvingcase studyPhonepe
SQL and Probability Interview PrepMedium
Practice
Practice drill

Calculate conversion probabilities by experiment variant and rank the variants using PostgreSQL.

JoinsprobabilityCase WhenSnap
Separating Two Bell DistributionsMedium
Practice
Recently asked
Practice drill

Separate two overlapping populations by estimating a boundary from labeled data.

probabilityMachine Learningcomplex queriesApplied Materials
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