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Interview Math: Over 50 Problems and Solutions for Quant Case Interview Questions Paperback – January 12, 2015

by Lewis C. Lin (Author)
4.2 out of 5 stars 50 ratings
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Introduction to the First Edition

Interview Math, 1st Edition provides 50+ practice problems and answers to help job seekers master quantitative interview questions including:

  • Market Sizing
  • Revenue Estimates
  • Profitability
  • Breakeven
  • Pricing
  • Customer Lifetime Value

If you're targeting one of the highly coveted after positions below, you'll need to master interview math questions:

  • Management Consulting: McKinsey, Bain, Boston Consulting Group, Deloitte
  • General Management: Capital One, Taser
  • Marketing: General Mills, Google, Hershey
  • Software Engineering: Goldman Sachs, Microsoft
  • Finance: American Airlines, Best Buy, JetBlue

You'll learn interview math concepts and principles — and then master those concepts with practice questions filled with detailed answers.

After going through the book, candidates will feel knowledgeable, confident, relaxed and ready to tackle consulting math questions.

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  1. Print length
    164 pages
  2. Language
    English
  3. Publication date
    January 12, 2015
  4. Dimensions
    8.5 x 0.37 x 11 inches
  5. ISBN-10
    9780692361474
  6. ISBN-13
    978-0692361474
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Editorial Reviews

About the Author

LEWIS C. LIN is CEO of Impact Interview, an interview coaching firm. Lewis was named by CNN as one of the "top 10 job tweeters you should be following." He has also been featured on FOX, ABC News, San Francisco Chronicle, The Atlantic, The Telegraph, and Business Insider. Before Impact Interview, Lewis was Microsoft's Director of Product Management. Prior to Microsoft, he worked at Google, leading new AdWords product launches.

Lewis has also written two other bestsellers on interview preparation: Decode and Conquer as well as Rise Above the Noise. He is also the author of Five Minutes to a Higher Salary, a salary negotiation book.

Lewis holds a B.S. in computer science from Stanford University and an M.B.A. from Northwestern University's Kellogg School of Management. He lives in Seattle.

Product details

  • ASIN ‏ : ‎ 0692361472
  • Publisher ‏ : ‎ Impact Interview (January 12, 2015)
  • Language ‏ : ‎ English
  • Paperback ‏ : ‎ 164 pages
  • ISBN-10 ‏ : ‎ 9780692361474
  • ISBN-13 ‏ : ‎ 978-0692361474
  • Item Weight ‏ : ‎ 13.9 ounces
  • Dimensions ‏ : ‎ 8.5 x 0.37 x 11 inches
  • Customer Reviews:
    4.2 out of 5 stars 50 ratings

About the author

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Lewis C. Lin

Lewis C. Lin

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LEWIS C. LIN is CEO of Impact Interview, an interview coaching firm. Lewis was named by CNN as one of the "top 10 job tweeters you should be following." He has also been featured on FOX, ABC News, San Francisco Chronicle, The Atlantic, The Telegraph, and Business Insider.

Before Impact Interview, Lewis was Microsoft's Director of Product Management. Prior to Microsoft, he worked at Google, leading new AdWords product launches.

Lewis holds a B.S. in computer science from Stanford University and an M.B.A. from Northwestern University's Kellogg School of Management. He also serves on the advisory board for University of Washington's software product management program.

Customer reviews

4.2 out of 5 stars
50 global ratings

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Customers say

Customers give positive feedback about the book's clarity. However, the practice material receives mixed reviews, with some customers finding it provides tons of practice while others say it's just a little practice.

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3 customers mention "Clarity"3 positive0 negative

Customers appreciate the clarity of the book, with one noting its clear structure.

"...was extremely clear, and provided examples after examples to practice on...." Read more

"...This books have a clear structure and tons of practice, and after completing those extercises, I felt much more confident in my interviews:)..." Read more

"...His explanations are great and clearly written out on the next page of each practice item...again - great...." Read more

8 customers mention "Practice material"5 positive3 negative

Customers have mixed opinions about the practice material in the book, with some finding it offers tons of practice while others say it provides little practice.

"...The book gave just the right amount of detail (which is totally different than, let's say, case interview secrets by Victor Cheng), was extremely..." Read more

"...This books have a clear structure and tons of practice, and after completing those extercises, I felt much more confident in my interviews:)..." Read more

"...However the practice part and exercise was very basic in level and way below the level of math I encountered in the firm’s I was interviewed for..." Read more

"...I'd love to see changed in future versions is this: He provides a lot of equations, but it would be better if he organized them a bit - because..." Read more

Top reviews from the United States

  • MichelleAU
    5.0 out of 5 stars so this book was perfect for that
    Reviewed in the United States on March 4, 2018
    Verified Purchase
    I had an upcoming interview with a top consulting firm, and I was very nervous about my ability to do the quant case studies. I knew that the case study for this particular consulting firm focuses on market sizing, so this book was perfect for that. The book gave just the right amount of detail (which is totally different than, let's say, case interview secrets by Victor Cheng), was extremely clear, and provided examples after examples to practice on. My confidence was built after reading through the book, and I was able to blast through my quant case study during the interview. Thank you, Lewis Lin!! Highly recommend.
    3 people found this helpful
    Helpful
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  • S. H.
    5.0 out of 5 stars Good practice
    Reviewed in the United States on November 2, 2016
    Verified Purchase
    I bought this book in preparation for a final round of case interviews. I learnt from previous interviews with the company that their cases are rather quant heavy - so I bought this as a supplement to 'case in point' just to get used to doing math problems in a case setting. This books have a clear structure and tons of practice, and after completing those extercises, I felt much more confident in my interviews:) Highly recommended!
    4 people found this helpful
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  • A
    4.0 out of 5 stars Good for drills and getting your brain back into this stuff
    Reviewed in the United States on March 16, 2016
    Verified Purchase
    If I had more confidence in my math, I don't think I wouldn't have made such dumb mistakes in my recent case interview. So, that's where this book comes in...if you have math issues. If you work through this book - it'll take some of the pressure off your math nerves so you can focus on the case question. My framework was great (thank you Victor Cheng and LOMS) - but I think I was overwhelmed by the prospect of all of this math, and that made the nerves worse...and I got lost. I had this book, among 2 others - but I only went through about 1/2 of it. I should have done more.

    I like how he has many pages of drills on many topics (e.g., break even, profit, customer value). And, I like how he makes them get harder as it goes along within each chapter. This is exactly the way to teach something. His explanations are great and clearly written out on the next page of each practice item...again - great.

    One thing I'd love to see changed in future versions is this: He provides a lot of equations, but it would be better if he organized them a bit - because many of these equations are conceptually linked. Unfortunately, they are just listed here in one big group (which can be intimidating and hard to remember). If I were teaching a course in case interview prep - I'd explain how you can get ROI and net income and break even from a similar set of numbers - so students could remember these things and how they all relate. In this book, there is just a list, so you'll have to do that on your own.

    I don't think any firms are doing estimation cases anymore, but you still may get a mini-estimation problem within a larger case at an MBB firm. So, he does have a chapter on those - and it is good mental exercise regardless. Speaking of that, I like his little "table of useful facts" - how many people in the USA, how many households, etc...
    11 people found this helpful
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  • Liz
    2.0 out of 5 stars Does not have someone with a social science degree
    Reviewed in the United States on April 29, 2020
    Verified Purchase
    The book had tactics for memorizing numbers and basic arithmetic. It’s a lot of theory and little practice. It did not improve my math skills.

    Luckily, my job interview was more strategy and presentation focuses because this book did not help.
    One person found this helpful
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  • Robby
    5.0 out of 5 stars Great workbook for talent development
    Reviewed in the United States on October 3, 2019
    Verified Purchase
    I initially purchased this book to help structure my thinking but thought it was so helpful that I purchased additional copies for everyone that works for me (I lead a product development group within a fortune 10 company).
    2 people found this helpful
    Helpful
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  • AR
    3.0 out of 5 stars Good basic start but definitely not enough
    Reviewed in the United States on September 12, 2018
    Verified Purchase
    Good cheat sheet to help you capture the formulas you need and good framework to do marketing estimations. However the practice part and exercise was very basic in level and way below the level of math I encountered in the firm’s I was interviewed for examples
    2 people found this helpful
    Helpful
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  • Runawaytrain
    5.0 out of 5 stars Five Stars
    Reviewed in the United States on June 17, 2016
    Verified Purchase
    Perfect we use it as part of our interview process
    2 people found this helpful
    Helpful
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  • Scott S.
    5.0 out of 5 stars Helpful
    Reviewed in the United States on April 25, 2016
    Verified Purchase
    To the point. Very efficient use of my time.
    2 people found this helpful
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Top reviews from other countries

  • Amazon Customer
    5.0 out of 5 stars Good book for Interview Case-Studies with a detailed approach laid ...
    Reviewed in India on April 2, 2016
    Verified Purchase
    Good book for Interview Case-Studies with a detailed approach laid out for different types of problems such as guesstimates, break-even, lifetime value etc. asked in interviews.
    Report
  • Kelly B.
    4.0 out of 5 stars Four Stars
    Reviewed in the United Kingdom on May 22, 2017
    Verified Purchase
    Good
    Report
  • Mrs Brett
    2.0 out of 5 stars Two Stars
    Reviewed in the United Kingdom on August 12, 2015
    Verified Purchase
    Very basic easy questions
    Report
  • savvina
    4.0 out of 5 stars Four Stars
    Reviewed in the United Kingdom on June 10, 2015
    Verified Purchase
    good
    Report
  • M. Julien Riposo
    1.0 out of 5 stars Nothing to do with math!
    Reviewed in the United Kingdom on June 25, 2017
    Verified Purchase
    As a quant, I've been very disappointed with this book. No probability, no Black-Scholes, but only brainteasers like 'why is a manhole circle' or of the same kind...
    Report