Hello! Regarding tips, the only thing that really works here is to make as many math-heavy cases as possible. Work for those key words in case-banks -PrepL has a very good and complete one- or work... (read entire answer)

# All questions tagged Math problem - Consulting Q&A - PrepLounge.com

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Hi Collin! Hope you are well. The solution 640 mn is correct. Let me explain: If something has 15% margin it means that Margin / Sales = 15% Therefore (Sales - Cost) / Sales = 15% Also,... (read entire answer)

Hi Anonymous, the most common formulas you need to know as part of the interview process are: Breakeven point Rule of 72 (usually related to calculation of CAGR) Perpetuity formula and ge... (read entire answer)

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 y... (read entire answer)

Hi, You can use the rule of 72: 72 / 20 = 3.6 - 3.6 years takes it to double 6 / 3.6 = 1.5 - 1.5 times it will double 10M * 2ˆ1.5 = 30M If you google the rule of 72 you'll find tons of... (read entire answer)

Hi! The market size of a player in this graph is equal to the area of all its squares. Just by eyeballing it you should be able to say that RetailCo is the market leader and Player A is the number... (read entire answer)

Hello, I would appreciate if anyone could help out with this quesiton. I do not understand the logic... (read entire question)

Hi, The best way is to practice, but practice in a smart way. Here are some tips and tricks to be most effective: Practice in front of someone else. I see loads of candidates say they have p... (read entire answer)

Hi, Several sources can help: Take all available case books and go through all the math problems there. Even the ones without a graph can be relevant since the universe of potential math prob... (read entire answer)

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 ca... (read entire answer)

Hi! I have written this earlier, and I will repeat it: the obsession with "Mental Math" is one of the many damaging nonsense myths that are flying around! Mental math is simply not something that i... (read entire answer)

Hi, 4 skills might be used here: Get used to round up and down (but ask the interviewer if that's ok) Learn how to multiply double digit numbers (https://www.youtube.com/watch?v=6ndkkPZYJHo... (read entire answer)

Hi, I recommend going through the GMAT math part and practice the equations there. There are many good books on that. Best

I don't think there's any hard & fast rule. If I feel like the math is getting a little more complex, or I have too many numbers to keep track of, I always err on the side of caution: better go a... (read entire answer)

Hi Anonymous, in general, the main issues with big numbers is forgetting zeros during operations. Potential tips to deal with big numbers are the following: Use correctly 10^ powers in your m... (read entire answer)

Hi Jana, It won't work where you have really ugly numbers but one trick to keep in mind is the 'invert and multiply'. So to use your case: 0.024/0.08 = (0.024/1) / (4/5)... (read entire answer)

20% margin means C = 0.8*P. If new price is 0.95*old price, then new margin is 0.95*P - 0.8*P=0.15*P, so your new margin is 15%. New volume * P * 0.15 = Old volume * P * 0.2 (price is same her... (read entire answer)

Hi guys! Just wondering if anyone has tried the FastMath Ace the Case course, and can give feedba... (read entire question)

Hi Jay, I'm a former McKinsey consultant, and I have a set of practice problems on several topcis that are more complex than mutlplcaiton or percentage calculations, like Breaekven Analysis, and ma... (read entire answer)

Hi, Here is how you can improve your math skills: 1) Fast math - train, train, and train again Learn how to multiply double digit numbers (https://www.youtube.com/watch?v=6ndkkPZYJHo... (read entire answer)