Get Your Mental Math Skills up to Speed

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

Easy
Best result:
359 points - Iliana
236 points - Navruz
75 points - Duncan
To the test
Medium
Best result:
22 points - Adri
17 points - Steffen
17 points - Theodor
To the test
Hard
Best result:
11 points - Theodor
8 points - Alexandru
8 points - jasper
To the test
Estimation
Best result:
49 points - Duncan
29 points - Lorenzo
23 points - Theodor
To the test

Subtraction

Easy
Best result:
180 points - Iliana
82 points - Theodor
75 points - Adri
To the test
Medium
Best result:
26 points - Theodor
24 points - Adri
23 points - Maximilian
To the test
Hard
Best result:
13 points - Theodor
13 points - Hannes
8 points - Alexandru
To the test
Estimation
Best result:
24 points - Theodor
20 points - Lorenzo
4 points - Lena
To the test

Multiplication

Easy
Best result:
229 points - Selin
119 points - Devavrat
114 points - Theodor
To the test
Medium
Best result:
46 points - Adri
36 points - Alexandru
26 points - Theodor
To the test
Hard
Best result:
41 points - Phuc
18 points - Christo
16 points - Jelle
To the test
Estimation
Best result:
22 points - Theodor
To the test

Division

Easy
Best result:
202 points - Theodor
101 points - Alexandru
76 points - Lester
To the test
Medium
Best result:
41 points - Adri
27 points - Theodor
26 points - Alexandru
To the test
Hard
Best result:
2 points - Felix
2 points - Theodor
2 points - Charlotte
To the test
Estimation
Best result:
20 points - Theodor
To the test

Percent

Easy
Best result:
115 points - Theodor
101 points - Alexandru
89 points - Emilie
To the test
Medium
Best result:
101 points - Alexandru
46 points - Lester
44 points - HM
To the test
Hard
Best result:
101 points - Alexandru
46 points - Theodor
42 points - HM
To the test
Estimation
Best result:
17 points - Theodor
16 points - Alexandru
9 points - Alifka
To the test

Random

Easy
Best result:
474 points - Anna
201 points - Leon
129 points - Aravinth
To the test
Medium
Best result:
65 points - F
41 points - DE
24 points - Antoine
To the test
Hard
Best result:
17 points - David
12 points - Theodor
8 points - Felix
To the test
Estimation
Best result:
17 points - Theodor
12 points - Lorenzo
To the test
Random - Method and Difficulty
Best Result:
16 points - Theodor
To the test
Do your mental math skills need a little update?
Sign up now for free and practice with our mental math tool.

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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