Did a McKinsey interview and was told I couldn’t use a calculator to do some of the calculations lmao. Really?? In the real world you always have tons of resources at hand.

Some were quick math like ratios/percentages so that’s easy. Others were more complex engineering calculations.

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The mental math is pretty easy - shouldn’t need one

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D2, yeah that I did. More details below btw

I've literally never had a case interview where you could use a calculator

And also I do think mental math is a part of our job - looking at two numbers and casually estimating a percent or ratio isn't uncommon

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Agreed units are simple, more details below.

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The fact that you think the system is broken and that they were unreasonable validates the system and process, exactly how it was designed to. Like many engineers, you weren’t able to abstract away the parts that were truly important to solve a complex problem in a way that gets the answer close enough.

You are making the wrong assumption about extracting what is truly important . I still completed the work and was told I got all answers correct

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You have to do mental math all the time in strategy consulting. For quick checks and to guide / reorient discussions. You can’t pull a calculator out in front of the CEO of a $20B a year business and keep a straight face.

Did your resume say "Integration Bee Winner" or something?

This one’s on you OP. You should have known that you weren’t allowed to use a calculator

You should read the comments before you respond, I knew a calculator wouldn’t be allowed.

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I think you missed the point of what case interviews are for

Please read comments first, wasn’t my point

Yeah I think you missed the mark with this one OP

OP, I'm thinking (like many others) that you overcomplicated the question. All of the math I got was at most just algebra, even if it involved technical disciplines. Unfortunately it also seems like you aren't willing to accept that feedback, and instead are continuing to argue the point and emphasize that you "still got all answers right."

I like to think this has just been burning in McK6 mind for weeks. Just stewing. Eventually they just couldn't bite their tongue.

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