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... (more)

# All questions tagged case math - Consulting Q&A - PrepLounge.com

and rise to the top

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... (more)

Hi Anonymous, this is what I would recommend for the math part: Repeat the question – candidates sometimes do mistakes answering the wrong question in the math part Present how you would li... (more)

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... (more)

Hi, It may be both. Or maybe he hasn't noticed the mistake himself. So just relax and keep fingers crossed. Best

Hi Lilian! This obsession with "Mental Math" is one of the many damaging nonsense myths that are flying around! Mental math is simply not something that is required in ANY way! You are not te... (more)

I would be interested - how are things looking this weekend?

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

Hey there, I made the following quickly on Excel. However, I wouldn't advise you to try memorise the whole thing, as it's a) a lot to try remember and b) doesn't have that much value. Rather, memor... (more)

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... (more)

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... (more)

Not a direct answer to your question, but make sure you are very comfortable with the math. 10-15 minutes/day on caseinterviewmath.com for example, will go a long way; this website will rank you per a... (more)

I have started to make a list. Would appreciate if you can help me add to it! Market sizing... (more)

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... (more)

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... (more)

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 comforta... (more)

Hi, There are several techniques that you can use: 1) Learn how to work with zeros. Best way - always use 10^power instead of zeros Example: 300x9000 = 3*10ˆ2 x 9*10ˆ3=3x9*10ˆ(2+3)=27*10ˆ... (more)

Hi, Ask the interviewer 1-2 times to get a sense of how comfortable he is with rounding numbers and how many zeroes he requires. Continue with an assumption that you should keep that level of... (more)

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 Curre... (more)

I would work backwards. But first, let's start with simple stuff. If the cost is €1 and the margin is 200%, this means that the sale price is €3 -> cost price x (1 + margin). So working backwards i... (more)