Case Interview Math

Case Interview Math is about analyzing data to help you create an informed recommendation to solve a case. You probably already know how to multiply, add, subtract, divide, and understand the concept of percentages. But, you need to understand what the math and the results mean. Often candidates without business backgrounds or first-timers of case [...]

How do you solve market sizing cases with the appropriate level of detail? My advice is you set the assumptions (define them explicitly) and generally you get about five minutes, up to ten minutes max to do this. Further segmentation leads to greater accuracy, but sometimes you don’t need greater accuracy — in which case, [...]

Case Interview Example – Estimation Question and Answer I was asked the following management consulting estimation question by a McKinsey interviewer many years ago: “Estimate how long it would take to move or relocate an average size mountain 10 miles using an average size truck” Below you will see my answer to this estimation question [...]

Below is a list of tips and recommended resources to assist in practicing quantitative case interview questions. Standardized Testing Practice Books: Standardized test prep books have example quantitative questions I would suggest looking in GMAT, GRE preparation books – and specifically look for the section that’s most similar to these types of questions. GRE Prep [...]

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 [...]

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 [...]