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Quick quantification in case interviews

What is the best way to practice quick quantification during interviews? E.g finding the percentage equivalent to 1/8, or finding the percentage change in costs between two figures, and other common case math. Does it just get better with practice? I see some people just having a natural intuition for these numbers and can quantify magnitudes quickly and accurately, and I wonder how they do it  

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Alessa
Coach
2 hrs ago
Ex-McKinsey Consultant & Interviewer | PEI | MBB Prep | Ex-BCG

hey there :)

Yes I would say, it mostly gets better with practice. Start by memorizing common fractions and their percentages (1/2 to 1/10), practice quick estimation with percentage changes, and do lots of timed mini-calcs outside full cases. Doing pure math drills, even 10–15 min daily, builds speed and intuition. I also run dedicated math practice with my mentees if you want to join.

best,
Alessa :)