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@candleField602 hours agoBrazil
Can I round aggressively in a case interview when the numbers are ugly?
- Case Math
Some case math gets messy enough that exact arithmetic slows me down a lot. How much rounding is acceptable before it starts changing the answer too much? Should I ask the interviewer before I simplify the numbers?
Similar Questions
What should I do if the interviewer gives me numbers in different units?
- Case Math
I sometimes get tripped up when one figure is in millions, another is per customer, and a third is monthly. What is the cleanest way to normalize units before calculating so I do not make a preventable case-math mistake?
Oct 27, 2026Germany
Top answer
Mayank G.Coach
Mayank G.CoachNormalize the units before doing the arithmetic. Most unit mistakes happen because candidates calculate first and try to reconcile units afterward.
How precise should my final number be when the assumptions in the case are rough?
- Case Math
If the inputs are estimates like market penetration or average spend, I am not sure how many decimals or significant figures to keep. In a case interview, is an approximate answer better than showing a very precise number built on rough assumptions?
Oct 24, 2026United States
Top answerMayank G.Coach
Mayank G.CoachMatch the precision of your answer to the precision of the assumptions. Rough inputs usually do not justify a result with several decimal places.
Should I correct a small arithmetic mistake if I notice it after moving on?
- Case Math
Sometimes I realize a few minutes later that I made a small arithmetic mistake earlier in the case. If the overall direction is still the same, should I interrupt and correct the number or just keep going?
Oct 22, 2026Morocco
Top answerMayank G.Coach
Mayank G.CoachCorrect it when the mistake affects the analysis or any number you are still using. A short, calm correction is better than carrying a known error through the rest of the case.