Hi there, Let me chime in here. First, try to think of this problem in terms of the expected value of the candidate drug: Expected Value = Likelihood of success * Present Value (in case of su... (more)

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

Ask a question## McKinsey Sample Case - Logic Question...

Hello Everyone, Did anyone interview with capital one ? They have a mix of qualitative and quanti... (more)

## Quant skills

Hi Moji, it seems your issue is not the math computation, but rather how to structure the math part once you receive a question (that is, the logic behind that you should apply). This means you sho... (more)

## Complex Math Drills

Not exactly what you are looking for, but i suggest you spend 15-20 minutes a day on caseinterviewmath.com for rapid-fire practice. It will rank you by speed and accuracy as well, i used it to grest e... (more)

## Getting stuck on case exhibits

Eugene, some really good questions in here! Let me try to address them. First, can you 'overthink'? Yes of course! I am not sure this was really the issue in your particular case though: sometimes,... (more)

## Math: word problems exercises

What do you mean by word problems? The mental math tool on this site is good for training your calculation speed

## Math tricks for small decimal numbers

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)... (more)

## BahnCard 25 / 50 / 100 Question

Answer should be 5600km. 1. Find total kms where: Avg. BC25 = BC100 (50 + x*0.75)/x = 3000/x 2. Find total kms where: Avg. BC50 = BC100 (200 + x*0.50)/x = 3000/x The larger answer is the corr... (more)

## Math prep : CAGR without excel - any tips?

Hi Anonymous, basically here you have to compute (1+x)^a=V where you don’t know x and where a=5 and V=1,5. For relative low interest rates and periods, the simpler process for precise... (more)

## Enhancing skills for mental math

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

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

## How to quickly calculate compound interest for a period of 54 years?

Hi Andreia, this is definitely a case where you can apply the rule of 72 to get a rounded answer: Step 1: find the amount of time the initial capital would double. Dividing 72 by 4, you get 1... (more)

## Calculations: When is an estimate not good enough?

Hi Anonymous, first of all, let me state that one result of proper case interview preparation will be that this question will become completely irrelevant to you. ALL calculations in Consulting cas... (more)

## How to divide and multiple thousands, milions and bilions fast?

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)

## Quantitative/Math Resources

Hi, I recommend downloading all possible casebooks you can find. Quickly go through each case but concentrate on solving the math problems that they have. To be honest, the way they solve the case... (more)

## Slow in parsing and digesting Math word problems at case interviews - how to improve?

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)

## Some math help please... adjusting price and solving for volume

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... (more)

## Moltiplications/divisions with 6+ digits numbers, estimation math_Tricks

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... (more)

## Mental Math vs. Paper Math? At what level of difficulty is it OK to switch from mental math to paper?

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)

## Setting up equations

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