Hi, 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. The best way - alw... (more)

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

and rise to the top

The best way to do is to break into simpler numbers wherever (numerator or denominator) large number exists. E.g. 11/275 Step 1: 275 is the number you want to break --> 25 * 11 = 275 Step... (more)

Hi Anonymous, assuming you can approximate numbers, in this case you can find what is a relatively small percentage (eg 1%) and see how the number you have to calculate compares to that. In this... (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, 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)

Hi, You can use preplounge tool, Viktor Cheng tool, Mimir Math on iOS Also, I recommend practicing the following: Learn how to multiply double digit numbers (https://www.youtube.com/watch?... (more)

Hi, why don't you use the one provided by PrepLounge (https://www.preplounge.com/en/mental-math.php)? It's pretty good! Best, Daniel

How many cases should I prepare for before the Bain Maths Test? How long do you think I would need b... (more)

Are you talking about caseinterviewmath.com? I often recommend that specific tool, since I used it myself to great effect. It will rank you by accurracy and speed against other applicants. I do not kn... (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)

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

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

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.

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