Get Active in Our Amazing Community of Over 451,000 Peers!

Schedule mock interviews on the Meeting Board, join the latest community discussions in our Consulting Q&A and find like-minded Case Partners to connect and practice with!

How does the Consulting Q&A work?

Anyone can ask a question

Anyone can write an answer

Upvotes let answers rise to the top

Case Math Prep

Case Interview case interview preparation case math Case Prep math

Most recent answer on Sep 01, 2023

Vlad

Expert

McKinsey / Accenture Alum / Got all BIG3 offers / Harvard Business School

Vlad

Expert

gave the best answer on Jul 27, 2018

McKinsey / Accenture Alum / Got all BIG3 offers / Harvard Business School

Hi, Pls find below my list 1) Case math Practice common market sizing topics (Airport passenger flow, real estate volumes, subway passenger flows, car usage, etc.). You should become comfortable with making assump ... (read entire answer)

2
Answers

3.8 k
Views

10
Total Upvotes

on Sep 01, 2023 on Sep 01, 2023
Last Activity

Math for case interviews

Case Interview fast math math

Most recent answer on Jul 27, 2023

Vlad

Expert

McKinsey / Accenture Alum / Got all BIG3 offers / Harvard Business School

Vlad

Expert

gave the best answer on Feb 26, 2020

McKinsey / Accenture Alum / Got all BIG3 offers / Harvard Business School

Hi, I recommend downloading all casebooks available online and check the math problems. You'll have a good list. Here are some of them to keep in mind: Interest rates calculations Compound margin NPV using the ... (read entire answer)

7
Answers

26.2 k
Views

25
Total Upvotes

on Jul 27, 2023 on Jul 27, 2023
Last Activity

Common math formulas

math quantitative

Question edited on Jul 27, 2023

gave the best answer on May 10, 2021

Hi there, Some key formulas/concepts: Breakeven NPV (with + without growth, perpituity + 1-2 years from now) % Change ROI Margin Markup Inventory turnover Some other helpful Q&As: https://www. ... (read entire answer)

4
Answers

1.5 k
Views

49
Total Upvotes

on Jul 27, 2023 on Jul 27, 2023
Last Activity

Looking for exciting discussions from the community?

Bcg finance formulas

BCG Case Interview case math Case structure and frameworks Finance formula Framework Market sizing math McKinsey quants

Most recent answer on Jul 27, 2023

Vlad

Expert

McKinsey / Accenture Alum / Got all BIG3 offers / Harvard Business School

Vlad

Expert

gave the best answer on Mar 18, 2018

McKinsey / Accenture Alum / Got all BIG3 offers / Harvard Business School

Hi, Here is a set of things you need to know: 1) Math and formulas: Interest rates calculations Compound margin NPV using the Rule of 72, Perpetuity CAGR using the Rule of 72 Currencies exchange calculat ... (read entire answer)

9
Answers

34.7 k
Views

64
Total Upvotes

on Jul 27, 2023 on Jul 27, 2023
Last Activity

New on PrepLounge: Consulting Math Workbook by Udayan

Consutingmath math preplounge

Most recent answer on Jun 23, 2023

Christine

Admin

asked on Feb 17, 2021

PrepLounge Community & Marketing Manager

Dear PrepLounge Community, We have something new to offer to you – the Consulting Math Workbook by Udayan! If you are scared of analytical questions in a case interview or if the idea of math intimidates you, then this guide is a great way for you to jump into the most common types of mathematical concepts that are tested as part of the consulting interview! This is the perfect product for you if you are looking for a workbook that: Focuses on the most important math concepts for consulting Gives detailed explanation on each concept with use cases Comes with many practice problems with deta ... (read entire question)

1
Answer

1.2 k
Views

3
Total Upvotes

on Jun 23, 2023 on Jun 23, 2023
Last Activity

1st round interview and math mistakes

case math math mistakes performance qualitative analysis quantitative

Most recent answer on Jan 14, 2023

Cristian

Expert

#1 rated MBB & McKinsey Coach

Cristian

Expert

gave the best answer on Mar 21, 2022

#1 rated MBB & McKinsey Coach

Hi there, As you might imagine, it's very hard to tell, but based on the info provided, if you do pass, it's going to be a borderline pass. Don't imagine that you need to have a perfect performance in order to pass ma ... (read entire answer)

6
Answers

2.5 k
Views

64
Total Upvotes

on Jan 14, 2023 on Jan 14, 2023
Last Activity

How to calculate NPV for a cost reduction

math profitability cost reduction

Most recent answer on Jun 13, 2022

Francesco

Expert

#1 Coach for Sessions (4.500+) | 1.500+ 5-Star Reviews | Proven Success (➡ interviewoffers.com) | Ex BCG | 10Y+ Coaching

Francesco

Expert

gave the best answer on Jun 13, 2022

#1 Coach for Sessions (4.500+) | 1.500+ 5-Star Reviews | Proven Success (➡ interviewoffers.com) | Ex BCG | 10Y+ Coaching

Hi there, The value generated by an asset in perpetuity can be calculated with the perpetuity formula as follows: V=FCF/(r-g) Where V = Value of the asset FCF = Free cash flow r= Discount rate g= Growth rate of FCF The ... (read entire answer)

4
Answers

1.5 k
Views

32
Total Upvotes

on Jun 13, 2022 on Jun 13, 2022
Last Activity

Got an invite for in-person (now zoom only) LEK numerical reasoning test - already passed the Applied

LEK LEK Consulting Logic London Londonoffice math numerical reasoning test

Most recent answer on Nov 09, 2021

Clara

Expert

McKinsey | Awarded professor at Master in Management @ IE | MBA at MIT |+180 students coached | Integrated FIT Guide aut

Clara

Expert

gave the best answer on Nov 12, 2020

McKinsey | Awarded professor at Master in Management @ IE | MBA at MIT |+180 students coached | Integrated FIT Guide aut

Hello! GMAT & the similar tests (like this one you are referring to with LEK), unfortunately only gets better with practicing. Good news is that there are many ways of doing so! There are free exams in the inte ... (read entire answer)

5
Answers

2.2 k
Views

3
Total Upvotes

on Nov 09, 2021 on Nov 09, 2021
Last Activity

Math: word problems exercises

Case Interview case interview preparation case math fast math math Math problem mental math Word problems

Question edited on Sep 05, 2021

Vlad

Expert

McKinsey / Accenture Alum / Got all BIG3 offers / Harvard Business School

Vlad

Expert

gave the best answer on Aug 08, 2018

McKinsey / Accenture Alum / Got all BIG3 offers / Harvard Business School

Hi, Something that helped my candidates - download ALL casebooks available online and go through the math problems in the cases. They will give a good sense of required business terminology. Then you can google what y ... (read entire answer)

4
Answers

9.2 k
Views

5
Total Upvotes

on Sep 05, 2021 on Sep 05, 2021
Last Activity

How fast do I need to do math in a case interview?

BCG Case Interview Case Interview math MBB

Question edited on Sep 05, 2021

Anonymous gave the best answer on Aug 02, 2019

First off, huge congratulations on your upcoming interview! To answer your question direct: accuracy trumps speed: I've never said no to a candidate who ticked off all other boxes, but was slow with maths. But I have ... (read entire answer)

10
Answers

9.3 k
Views

17
Total Upvotes

on Sep 05, 2021 on Sep 05, 2021
Last Activity

Best resources for math improvement? (for a complete number novice!)

fast math math mental math Quantitative skills

Recent activity on Sep 05, 2021

Vlad

Expert

McKinsey / Accenture Alum / Got all BIG3 offers / Harvard Business School

Vlad

Expert

gave the best answer on Aug 22, 2019

McKinsey / Accenture Alum / Got all BIG3 offers / Harvard Business School

Hi, Basically, you need to develop 3 calculation skills: 1) Learn how to multiply double-digit numbers (https://www.youtube.com/watch?v=6ndkkPZYJHo). 2) Learn how to work with zeros. Best way - always use 10^power ... (read entire answer)

5
Answers

3.3 k
Views

9
Total Upvotes

on Sep 05, 2021 on Sep 05, 2021
Last Activity

How to do divisions fast

arithmetic Division math

Question edited on Sep 05, 2021

Marco-Alexander

Expert

Former BCG | Case author for efellows book | Experience in 6 consultancies (Stern Stewart, Capgemini, KPMG, VW Con., Hor

Marco-Alexander

Expert

gave the best answer on Sep 05, 2021

Former BCG | Case author for efellows book | Experience in 6 consultancies (Stern Stewart, Capgemini, KPMG, VW Con., Hor

on Sep 05, 2021 on Sep 05, 2021
Last Activity

Do you have a question for our consulting experts, too?

London MBB (+ OC&C, LEK, RB etc) Math Tests

math Online Tests

Most recent answer on Dec 09, 2020

gave the best answer on Oct 21, 2020

My understanding is you should not have to worry about geometry and trig. Much more important are equations/math that have to do with key business terms incl breakeven, margins, ROI, NPV, etc. etc. In general, the bes ... (read entire answer)

2
Answers

1.5 k
Views

5
Total Upvotes

on Dec 09, 2020 on Dec 09, 2020
Last Activity

Mental math - division

math

Most recent answer on Nov 16, 2020

Vlad

Expert

McKinsey / Accenture Alum / Got all BIG3 offers / Harvard Business School

Vlad

Expert

gave the best answer on Sep 17, 2019

McKinsey / Accenture Alum / Got all BIG3 offers / Harvard Business School

Hi, Simply learn the division table up to 1/11 (i.e. 5/6 = 83.3%). It will help you calculate any percentage problems. For example, if your market is $620M and your revenues are $51M you can use 5/6 as a proxy to calc ... (read entire answer)

4
Answers

1.8 k
Views

5
Total Upvotes

on Nov 16, 2020 on Nov 16, 2020
Last Activity

Effective math tool

acethecase calculations Case cheng consulting math percentage

Most recent answer on Aug 31, 2020

Vlad

Expert

McKinsey / Accenture Alum / Got all BIG3 offers / Harvard Business School

Vlad

Expert

gave the best answer on Sep 12, 2018

McKinsey / Accenture Alum / Got all BIG3 offers / Harvard Business School

Hi, Any of these tools are good: Preplounge Mental Math, V. Cheng, Mimir Math. It's more about the skills. I recommend to concentrate on the following: 1) Learn how to multiply double digit numbers (https://www.yo ... (read entire answer)

5
Answers

3.8 k
Views

8
Total Upvotes

on Aug 31, 2020 on Aug 31, 2020
Last Activity

Hi coaches, could you plz provide some advise for improving mental calculations?

calculation math

Recent activity on Aug 22, 2020

Clara

Expert

McKinsey | Awarded professor at Master in Management @ IE | MBA at MIT |+180 students coached | Integrated FIT Guide aut

Clara

Expert

gave the best answer on Dec 05, 2019

McKinsey | Awarded professor at Master in Management @ IE | MBA at MIT |+180 students coached | Integrated FIT Guide aut

Hello! The best is to practice, practice, practice! I could recommend you to start with: 1. GMAT exams: that can be found for free in the internet (GMAT prep with The Economist, London Business School free trial, e ... (read entire answer)

4
Answers

1.6 k
Views

21
Total Upvotes

on Aug 22, 2020 on Aug 22, 2020
Last Activity

Tips for optimizing preparation for MBB

Case FIT math MBB tips

Most recent answer on Aug 13, 2020

Daniel

Expert

McKinsey / ex-Interviewer at McKinsey / I will coach you to rock those interviews

Daniel

Expert

gave the best answer on Sep 18, 2019

McKinsey / ex-Interviewer at McKinsey / I will coach you to rock those interviews

Hi! Here are my 5 tips: 1) Practice mental calculation daily (percentages, decimal places, large numbers, arithmetic) – even though it's not the most important part of the interview and it's allowed to make mistakes ... (read entire answer)

5
Answers

12.9 k
Views

29
Total Upvotes

on Aug 13, 2020 on Aug 13, 2020
Last Activity

Mental math app for practising fractions/percentages

case math fast math fraction math mental math percentage

Recent activity on Aug 08, 2020

Luca

Expert

BCG |NASA | SDA Bocconi & Cattolica partner | GMAT expert 780/800 score | 200+ students coached

Luca

Expert

gave the best answer on Apr 13, 2020

BCG |NASA | SDA Bocconi & Cattolica partner | GMAT expert 780/800 score | 200+ students coached

Hello Richard, Thanks for sharing! Actually I have many candidates that struggle with mental math, I will take a look to your app. Best, Luca

7
Answers

6.3 k
Views

33
Total Upvotes

on Aug 08, 2020 on Aug 08, 2020
Last Activity

What are some ways you can improve guiding the interviewer through the math portion of a case

math

Most recent answer on Aug 03, 2020

Clara

Expert

McKinsey | Awarded professor at Master in Management @ IE | MBA at MIT |+180 students coached | Integrated FIT Guide aut

Clara

Expert

gave the best answer on Jul 30, 2020

McKinsey | Awarded professor at Master in Management @ IE | MBA at MIT |+180 students coached | Integrated FIT Guide aut

Hello! This is indeed a great point to flag, since it´s one of the things that got more complicated with the online version of the loops. Indeed, "guiding your interviewer through your toughts" is always a classic ... (read entire answer)

6
Answers

1.0 k
Views

53
Total Upvotes

on Aug 03, 2020 on Aug 03, 2020
Last Activity

How can I best prepare for my PST within two weeks?

math McKinsey PST

Question edited on Jul 31, 2020

Francesco

Expert

#1 Coach for Sessions (4.500+) | 1.500+ 5-Star Reviews | Proven Success (➡ interviewoffers.com) | Ex BCG | 10Y+ Coaching

Francesco

Expert

gave the best answer on Nov 22, 2019

#1 Coach for Sessions (4.500+) | 1.500+ 5-Star Reviews | Proven Success (➡ interviewoffers.com) | Ex BCG | 10Y+ Coaching

Hi Anonymous, as general practice for the PST, I would recommend the following approach: Try to find at least 5-6 practice cases online. There are several available for free, if needed you can purchase additional ... (read entire answer)

4
Answers

1.5 k
Views

19
Total Upvotes

on Jul 31, 2020 on Jul 31, 2020
Last Activity

1 - 20 of 30 results

Consulting Q&A – Ask Questions about Your Career

In this overview, you will find all the questions asked so far by the PrepLounge community. Anyone can ask questions and write answers. Our coaches are also happy to share their expertise. If you like an answer, give it an upvote so that it rises to the top. Here you can also find our guidelines and FAQs for the Consulting Q&A.