Hello Richard, Thanks for sharing! Actually I have many candidates that struggle with mental math, I will take a look to your app. Best, Luca

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

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Hi Nils, the approach is correct and I think you can reach half of the time with it by practicing a bit. Preplounge math tool is super helpful and I also love this Youtube channel (here a video for f... (read entire answer)

Hi, here you can find a detailed approach to solve it in a quick approximated way and in an accurate way: https://www.youtube.com/watch?v=do_IbHId2Os I recommend you to take a look at the channel,... (read entire answer)

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... (read entire answer)

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... (read entire answer)

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... (read entire answer)

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?... (read entire answer)

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... (read entire question)

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... (read entire answer)

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... (read entire answer)

Hi Anonymous, I agree with Vlad, brainteasers are not very common (referring to my experience, when I applied, I got 1 out of 20+ interviews). Still, answering to your question, why do they ask the... (read entire answer)

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... (read entire question)

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... (read entire answer)

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... (read entire answer)

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... (read entire answer)

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... (read entire answer)