Schedule mock interviews on the Meeting Board, join the latest community discussions in our Consulting Q&A and find like-minded Interview Partners to connect and practice with!
Back to overview

Percentage Math Practice

Hey guys! 

I am looking for a math tool to practice calculation of percentages such as margins. The traditional mental math training tools from https://www.caseinterview.com/math/mathtest.php and preplounge only train to caclulate absolute numbers form percentage rate, but not percentages such as margins from absolute numbers. I am looking for calculations such as 25m/40m etc. 

Does anyone know a tool or qa way to practice these calculations?

Best wishes! 
Mark

3
5.0k
30
Be the first to answer!
Nobody has responded to this question yet.
Top answer
Sidi
Coach
on Jul 18, 2018
McKinsey Senior EM & BCG Consultant | Interviewer at McK & BCG for 7 years | Coached 400+ candidates secure MBB offers

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).

What you can do is to just create a simple excel sheet where you generate two random numbers as numerator and denominator:

=ROUND(RANDBETWEEN(1;1000);0)

Paste this formula into two cells, and then just divide the numerator by the denominator to get the result (you can put this on a different tab to hide it if you want). Then do the calculation manually and check the correctness of your result. To generate new random numbers just place the cursor on an empty cell and hit DEL.

Cheers, Sidi

Deleted user
on Jul 22, 2020

Dear A,

Recently there was a post from a participant of PL community who shared his inventions on math app for practicing math fractions and percentages from one of PL participant https://apps.apple.com/us/app/case-math/id1507653375?mt=8&ign-mpt=uo%3D4

Hope it helps,

Best,

André

0
Clara
Coach
on Nov 16, 2020
McKinsey | Awarded professor at Master in Management @ IE | MBA at MIT |+180 students coached | Integrated FIT Guide aut

Hello!

Have you tried the GMAT prep from The Economist? It helped me a lot. 

Hope it helps!

Cheers,

Clara

Similar Questions
Consulting
Mckinsey solve test in 3 weeks - how to organise?
on Nov 05, 2024
Global
2
2.5k
Top answer by
Florian
Coach
1400 5-star reviews across platforms | 600+ offers | Highest-rated case book on Amazon | Uni lecturer in US, Asia, EU
42
2 Answers
2.5k Views
Consulting
How do I improve self confidence?
on May 28, 2025
Global
7
300+
Top answer by
Deleted user
21
7 Answers
300+ Views
+4
Consulting
Why do I get the math part wrong everytime and how can i improve?
on Jan 22, 2025
South America
7
1.2k
Top answer by
Ian
Coach
Top US BCG / MBB Coach - 5,000 sessions |Tech, Platinion, Big 4 | 9/9 personal interviews passed | 95% candidate success
23
7 Answers
1.2k Views
+4