Case Interview Math

I'm often fond of saying that: Math Never Lies, But It Does Often Mislead Let me give you an example to illustrate this point. Let's say you use math to analyze a client and discover they generate $100 million in profit. Is this good or bad? It's a simple question. From a math perspective, all [...]

The following video is a funny example of how NOT to do math in a case interview. The math question is: "If you're traveling 80 miles per hour, how long does it take you to travel 80 miles?" See one person's answer (who by the way should NOT work in consulting). Note: This video has [...]

When I am contacted by candidates who have made it through the case interview process with a successful offer, often I get emails like the one below with tips for those still interviewing. Field Report: It's been about 8 months that I was dreaming to write this e-mail to you. Tomorrow I'm joining McKinsey in [...]

Question: I have just subscribed to your website and I find your videos and notes very helpful. I have my first round interview with McKinsey this week (I was notified less than a week before) and I have already taken the PST and looked at other companies' tests as well. In the email I received, [...]

Question: How To Do a Market Sizing at the Appropriate Level of Detail Hi Victor, I was wondering if you had any tips on how to get a read on the interviewer during market sizing specific questions. Since market sizing questions are ambiguous, it is up to the interviewee to establish constraints in the form [...]

This post provides the answer on how to answer the estimation question example I posted previously. You'll notice in the comment section of that previous post there were a wide range of answers -- most of which were incorrect. The first thing to realize in an estimation question is that an acceptable answer MUST mention [...]

It is important to develop your basic math skills to a high level of proficiency while under the pressure and stress of an interview. The best way to do that is to practice your math skills while timing yourself. I am working on creating such a tool for members of my case interview preparation community. [...]

Question: I purchased your Look Over My Shoulder® program and find it really helps me a lot to prepare for my case interviews. However, listening to all the cases I stumbled upon an inconsistency that confuses me a bit. In the one of the cases the candidate X's out "Cost" as an area to look [...]

Question: Thank you so much for your online tutorial sessions. They are by far the best resources that I have come across so far in terms of case study prep. I will also be purchasing your "Look Over My Shoulder®" program very shortly and am excited to see what that entails. I did have a [...]