Would a consulting firm not hire you on the basis that you couldn't do the mental math on the case fast enough? Any tips on mental math prep?

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I BOMBED the mental math on many my cases. Was doing totally fine in mental math on case interviews - had one bad experience and then my nerves were shot from then on. Just did the best I could, slowed down, and wrote it out when necessary. Acknowledged that it was slow, but didn't really apologize. Still got through to final rounds at McKinsey, Deloitte, Accenture etc. and got offers to a few

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Yes. Practice more.

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Super fast mental math was never going to be my strong suit so I just owned it, went slow and wrote things out. Got 4/5 offers. I went into it thinking if that's what they are looking for from me- it's not the right fit. I didn't even acknowledge I was going slow and I definitely didn't apologize.

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There was an Udemy course about case math (don't remember the name though)

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Best tool (which I used relentlessly) is Victor Cheng's case math drill tool: https://www.caseinterview.com/math/home.php

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^in theory I agree it's how it should be. In practice, you have such good applicants that you are picking one over the other on the smallest details like mental math...or other ridiculous things I shouldn't say

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And there are courses online plus books that help you get better at it

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Yes

^ Yeah, it's good for practice, but it doesn't teach you any techniques to improve speed (like left to right operations and so on)

Thanks S&1, solid recommendation. I entirely forgot he has a math section on his website.

Where you have Internet and smart phones, mental math is like doing a wheelie. It doesn't give you an edge. Firm understanding of the concepts is what's important.

^ agree :/

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