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Why do I always black out when it comes to structuring my math approach in a case?

Basically, I have been practicing cases for a few months now and most of the elements are going well. My structuring is good and the calculations (multiplication, division etc) are usually correct. 
However, when it comes to actually structuring a more complex mathematical calculation, the cases go poorly. I always take a moment (that is what I have been advised to do), but I can never actually figure out what to do, it's like my mind is empty at that moment and I panic. I was pretty strong at college math, so I am not sure what I can do to fix this at this point. 
I was wondering if you guys have any tips or maybe even elegant ways to deal with this in the actual interview? 

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Evelina
Coach
on Jul 01, 2025
EY-Parthenon (7 years) l BCG offer holder l 97% success rate l 30% off first session l free 15' intro call l LBS

Hi there,

Many strong candidates face this challenge when it comes to structuring more complex math under pressure.

Here are a few quick tips to help:

1. Use a simple math structure.
Treat each math problem like a mini-framework. Ask yourself:

  • What am I solving for?
  • What info do I have?
  • What’s the cleanest path to the answer?
    Breaking it down into 2–3 steps on paper can help make the problem feel more manageable.

2. Use a table to stay organized.
Especially when dealing with multiple segments or assumptions, a quick table can keep your thinking clear and reduce errors. It also shows structured thinking to the interviewer.

3. Speak your logic out loud.
Even if you're unsure, verbalizing your approach shows your process — which is often more important than getting the exact number right.

4. Reframe the pause.
Instead of freezing, use that moment to slow down, jot down what you know, and map out the steps calmly. That small shift in mindset often prevents the "blanking out" effect.

You're already on the right track — strong math foundation, awareness of the issue, and the drive to improve. Let us know if you’d like to run a few math-focused drills together or case prep in general.

Best,

Evelina

Hagen
Coach
on Jul 04, 2025
#1 recommended coach | >95% success rate | 9+ years consulting, interviewing and coaching experience

Hi there,

First of all, I am sorry to hear about your frustrating experience with quantitative questions!

I would be happy to share my thoughts on your situation:

  • First of all, and contrary to what other coaches have said, it is unfortunately impossible to give meaningful advice without seeing how you answer quantitative questions. Therefore, I would strongly advise you to consider working with an experienced coach like me on this topic.
  • Moreover, in general, though, if you're having trouble with a specific part of a case study, it may be helpful to practice this topic on its own for a few days.

You can find more on this topic here: How to succeed in the final interview round.

If you would like a more detailed discussion on how to best prepare your application files, for your upcoming pre-interview assessments and/or interviews, please don’t hesitate to contact me directly.

Best,

Hagen

Jeroen
Coach
on Jul 01, 2025
Ex-Netherlands Recruitment Lead OW | 5+ years of coaching experience | Great Price/Value | Free Intro Calls

Adding to the points above. It seems to be related to performance pressure and/or anxiety on the surface. 

Therefore, I always recommend candidates to practice live cases with as many different people as you can. For more specific tips, it’s better to actually speak through that live. 

Please reach out if you want to schedule a free intro chat to explore how I might be able to help. 

Sarah
Coach
edited on Jul 01, 2025
Ex-McKinsey EM in London, foreign student with no prior consulting internship experience

A different suggestion but if the other great advice from the other coaches don’t work, you can try this:


Go with your intuition, don’t fight it. You may be blanking out because you’re trying too hard to come up with a structure upfront.

Most of the math (even in complex cases) you’ll come across is simple multiplication and addition - you likely intuitively know which figures to multiply by what.


Just jot that down first, complete your thought, then infer the structure you’ll use to present.


Once you get over that mental block coming up with a structure upfront will be much easier.

on Jul 01, 2025
#1 Rated McKinsey Coach | Top MBB Coach | Verifiable success rates

Hi there, 

Sorry to hear this. 

It's rather common, but the root causes can be varied. I would be able to tell if I saw you in a live case. But I would try a few things:

  1. Keep going. The nerves will level off with time.
  2. Divide the stages of the calculation question. When you take time, focus only on coming up with the logic / approach (don't get into the numbers themselves)
  3. Talk yourself through the approach
  4. Try to work the logic backwards from the target result

Best,
Cristian 

Alberto
Coach
on Jul 01, 2025
Ex-McKinsey AP | Professional MBB Coach | +13yrs experience | +2,000 real interviews | +150 offers

Hi there,

I totally get how frustrating this can be — and while I can’t pinpoint exactly why it’s happening, here’s how to tackle it:

  • Practice solo at first to avoid the added pressure of a partner watching
  • Ditch the complex equations and focus on simple business logic
  • Use basic trees to break down your calculations step by step
  • If you’re still freezing mid-case, get help from a coach who can spot the root cause and work through it with you

Sometimes it’s mindset. Sometimes it’s just the wrong practice approach. Either way, it’s solvable.

Best,

Alberto

Mariana
Coach
on Jul 02, 2025
xMckinsey | Consulting and Tech | 1.5h session | +200 sessions | Free 20-min introductory call

Hi there,

So sorry for this situation, I know how it feels like because I have faced issues with the math portion as well.

In addition to what other coaches have mentioned, I recommend you this article about math and how to deal with this kind of issue.

Best,

Mari

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