Rounding numbers during case interview

Is it okay to to round a number like 2.5 million to 3 million while doing math in a case interview? It would be easier when it comes to finding the percentage.

Also, is it okay to do long division on paper during the case interview? Thanks!

3 Comments
 

When I talked to consultants about this, they told me rounding was fine or creating easy whole numbers for assumptions was also fine. Just say something like "I'm going to make some assumptions about population/market size, let me know if any of them are off or need to be edited." Generally, it's the thought process that matters not the actual assumptions/numbers

 
Most Helpful

Rerum autem eaque sequi ut ratione sequi optio. Aut et incidunt laudantium perferendis magnam id voluptate. Exercitationem quaerat consequatur voluptatum sed. Ratione dignissimos quia vitae laboriosam molestiae non ducimus. Porro eligendi aut occaecati dolores. Veniam omnis exercitationem molestiae quasi est et nihil. Praesentium ipsa quia quod earum illo. Repudiandae quasi non accusantium totam quia.

Eos non quo impedit exercitationem mollitia aut doloribus illum. Eius aut quasi fugiat ut tenetur quis.

Molestiae possimus aspernatur sed vero recusandae. Ea voluptates dolores tenetur quisquam.

Career Advancement Opportunities

October 2026 Consulting

  • Boston Consulting Group 99.5%
  • Bain & Company 98.9%
  • McKinsey & Company 98.4%
  • Oliver Wyman 97.9%
  • LEK Consulting 97.4%

Overall Employee Satisfaction

October 2026 Consulting

  • Cornerstone Research 99.5%
  • Bain & Company 98.9%
  • Boston Consulting Group 98.4%
  • McKinsey & Company 97.9%
  • Oliver Wyman 97.4%

Professional Growth Opportunities

October 2026 Consulting

  • Bain & Company 99.5%
  • Boston Consulting Group 98.9%
  • McKinsey & Company 98.4%
  • Oliver Wyman 97.9%
  • LEK Consulting 97.4%

Total Avg Compensation

October 2026 Consulting

  • Partner (4) $361
  • Principal (30) $294
  • Director/MD (59) $274
  • Vice President (53) $245
  • Engagement Manager (114) $233
  • Manager (171) $173
  • 2nd Year Associate (185) $142
  • 3rd+ Year Associate (116) $137
  • Senior Consultant (355) $132
  • Consultant (642) $122
  • 3rd+ Year Analyst (164) $121
  • 1st Year Associate (577) $121
  • NA (16) $114
  • Engineer (6) $114
  • 2nd Year Analyst (394) $105
  • Associate Consultant (176) $101
  • 1st Year Analyst (1170) $90
  • Intern/Summer Associate (208) $83
  • Intern/Summer Analyst (642) $68
notes
16 IB Interviews Notes

“... there’s no excuse to not take advantage of the resources out there available to you. Best value for your $ are the...”

Leaderboard

1
redever's picture
redever
99.2
2
BankonBanking's picture
BankonBanking
99.0
3
kanon's picture
kanon
99.0
4
Secyh62's picture
Secyh62
99.0
5
DrApeman's picture
DrApeman
98.9
6
GameTheory's picture
GameTheory
98.9
7
dosk17's picture
dosk17
98.9
8
CompBanker's picture
CompBanker
98.9
9
Betsy Massar's picture
Betsy Massar
98.9
10
Mimbs's picture
Mimbs
98.8
success
From 10 rejections to 1 dream investment banking internship

“... I believe it was the single biggest reason why I ended up with an offer...”