# You need good math skills to succeed in consulting interviews

## Basic math skills will be tested in all case interviews, so you need to practice mental math especially if it is not your natural strength

One of the basic skills a candidate requires is good mental math abilities. Your interviewer will **test this skill** either directly by asking a math question such as "what is the square root of 759?" or in an indirect manner while solving a business case problem.

Interviewers can differentiate between hard and soft mistakes. Calculation errors are considered **hard mistakes** because there is no partial answer in math. Therefore, you must improve or refresh your mental math skills before interviews. Remember, it is alright to use a scratch paper for most calculations but it is expected that you are able to mentally perform easy calculations. Try the following tool to improve your mental math skills.

## Impress the interviewer by outstanding mental math skills

Possessing excellent mental math skills are crucial during case interviews because you will need these skills as a consultant. In general, there are two main reasons why consultants should possess excellent math skills:

- As a consultant you will come across several occasions, in which you will require mental math skills. Estimation skills can
**save a lot of time**and in some cases help figure out unnecessary analysis that can waste a lot of time if a quick estimation is not done (see 80/20 or pareto principle). Without great math skills, you could end up spending the entire night using Excel. - You can easily
**impress**your client by demonstrating to them that you are a**potential math genius**. Clients often pay a lot of money to you (or your employer) and expect total wisdom and cleverness. Quick math solutions can be an effective way to convince clients of your recommendations.

Agree with Vladislav, it's a great tool. Any chance that this will come out as an app?

Hi Vladislav, Thanks so much! Glad you like the tool. It indeed is a confidence booster :)

Really cool tool, can be used to boost confidence as well!

Nice tool!