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Learn the case interview basics, practice with 200+ cases, and benefit from extensive test materials, and interactive self-study tools.

Addition

Easy
Best result:
440 points - Jennifer
364 points - Petra
184 points - Federica
Medium
Best result:
84 points - ravi
46 points - Jennifer
26 points - Federica
Hard
Best result:
44 points - Tom
35 points - Jelle
20 points - Jennifer
Estimation
Best result:
43 points - Jennifer
31 points - re
27 points - Anton

Subtraction

Easy
Best result:
396 points - Tyler
303 points - Petra
291 points - Corsin
Medium
Best result:
37 points - Jennifer
34 points - Corsin
30 points - Matteo
Hard
Best result:
67 points - Tom
38 points - Jelle
27 points - Angela
Estimation
Best result:
26 points - Max
21 points - Maximilian
16 points - Martin

Multiplication

Easy
Best result:
1107 points - Christina
1034 points - Tyler
709 points - Jennifer
Medium
Best result:
500 points - Atos
55 points - Ethan
43 points - Corsin
Hard
Best result:
67 points - Phuc
22 points - Jelle
19 points - Harald
Estimation
Best result:
74 points - Nargiz
25 points - Maximilian
20 points - S

Division

Easy
Best result:
1308 points - Tyler
725 points - olavo
668 points - Leon
Medium
Best result:
74 points - Ethan
49 points - Corsin
46 points - Jun
Hard
Best result:
11 points - Prashanth
10 points - Christopher
6 points - Robin
Estimation
Best result:
25 points - Martin
22 points - pncd
21 points - Julia

Percent

Easy
Best result:
600 points - Anna-Lena
532 points - Angela
258 points - Franziska
Medium
Best result:
156 points - Corsin
154 points - Angela
118 points - Anna-Lena
Hard
Best result:
1513 points - Prashanth
139 points - Jose
133 points - Angela
Estimation
Best result:
23 points - Tom
20 points - re
18 points - S

Random

Easy
Best result:
541 points - Quentin
507 points - Tyler
452 points - Mikhail
Medium
Best result:
419 points - David
338 points - Samrudhi
130 points - Ian
Hard
Best result:
23 points - Prashanth
18 points - Samrudhi
14 points - Jose
Estimation
Best result:
82 points - Samrudhi
78 points - Howard
29 points - Quentin
Random - Method and Difficulty
Best Result:
12 points - Cem
11 points - A Sesarin
11 points - Robin
Do your mental math skills need a little update?
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Practice Your Consulting Mental Math for Free

Fast and accurate mental math is a necessary requirement to pass your job interview at consulting companies like McKinsey, BCG or Bain. Therefore, you should invest regular time in training your case math skills. Find out more about why good math skills are so important for your case interview in our Case Interview Basics article about fast math.

This Is How the Mental Math Tool Works

Choose one of the 24 tests above to check and improve your case math skills for free. You can take a test as many times as you want and see how you improved over time. Check out how you perform compared to other candidates. The top 3 ranking is recalculated monthly which means that you have the opportunity to climb the winners' podium every month. All other values (your average, all users average and your best results) are all-time values.

Mental Math Practice – Train Your Math Skills for Your Case Interview in Consulting

Use our interactive and user-friendly mental math tool to train your case interview math with respect to all basic operations (e.g. addition, multiplication, percentage). By comparing your performance to the overall PrepLounge community, you can improve your case math skills and make sure that you will be prepared for any calculations in your consulting interview.

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