Hi, Basically, you need to develop 3 calculation skills: 1) Learn how to multiply double digit numbers (google fast math tips or The Veda math). 2) Learn how to work with zeros. Best way - al... (more)

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

Ask a questionThanks for the replies guys! I know (and use) caseinterviewmath.com as well. A good website indeed, but only for practicing. They don't provide "tips and tricks" on how to solve sums like the afore... (more)

There are many sources u can use e.g. 1. Mental Maths Tool from Preplounge 2. Mental Maths Tool from Victor Cheng 3. GMAT Questions 4. IQ Test also include mental maths questions e.g. sol... (more)

Hi, There are two 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*10ˆ5... (more)

Hi Anonymous, in general the best way to improve your math is to first identify your weak points, then work accordingly on them. That’s because “generally” prepare for math won’t optimize your prep... (more)

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)

Hi, You can use the rule of 72. For example, if you know the revenue will grow from 100M to 400M in 12 years and you need to know the CAGR: 100M will double and grow to 200M in 6 years C... (more)

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)

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, For math you should: Present the interviewer your approach (formula, calculation steps, equation, etc) Check with him whether the approach is correct Start calculations Come back to... (more)

Hi Mark, I am not sure I understand your challenge. Performing this kind of calculations will already give you the percentage, just expressed as a decimal figure (0,625 or 62,5% in your above example... (more)

Hi Anonymous, my advice here: do NOT do such calculations in your head during an interview! You will not get ANY bonus points for this! The only two things that count are (1) You are consistently co... (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, As for structuring - I've answered here: https://www.preplounge.com/en/consulting-forum/how-to-structuring-the-market-sizing-case-2301 For math skills you need to learn: Rounding u... (more)

Hi there, I quickly created a table for you in Excel - please see below :)

Another little tip is to practice with multiplications, rather than divisions. It seems to be easier on the brain. E.g. 30% of 7 is easier done this way: 1) 7 x 30 = 210 2) Divide by 100.

On a related note: I have always had very positive feedback from interviewers when I told them that I already knew the answer to a given brainteaser, instead of pretending to solve it right then a... (more)

Hi A, Download mental math for your Iphone and practice everyday at least 10 min. All the best, Egor