Calculation Mental Challenge: the free app that turns mental calculation into a class duel

Last updated on 24 June 2026

You know that moment. The morning mental calculation ritual, the raised slate, the same three students who respond quickly and the others who drop out. You vary the media, you project series of operations, but holding the attention of the whole class for ten minutes of calculation is often complicated. Especially when the levels are very heterogeneous.

In short. There is an application that takes this problem by another side: motivation through play and collective emulation. It is called Calcul Mental Challenge, it is edited by Studiophel, and it has a rare argument: free of charge, without advertising, without compulsory registration, and covering the entire spectrum of CE1 in high school.

I took a close look at that. I enjoyed it.

What is Calcul Mental Challenge?

It is a mental calculation application available on almost everything: Windows, Mac, Linux, Android and iOS. Its ambition is in one sentence: make mental calculation less boring for students, without advertising or mandatory account.

The result is surprisingly complete. There are a dozen game modes, several operations, a classroom mode for teachers, and even competitions between schools.

What is striking first is the alignment with the programme. Each level follows the expectations of the Official Bulletin. In CE1 we work additions, subtractions posed and simple supplements. In CM2 the decimals and the order of magnitude are attacked. In college come fractions, relative and powers. The detailed progress on the site goes up to the second (real, algebraic calculation, powers), then switches to a category Competition oriented fast calculation, traps and strategies. It is not a calibrated tool for primary education that we are trying to stretch upwards: Progression is thought by cycle.

Features That Really Matter to the Classroom

There is no need to list all modes one by one. Let's focus on what changes something for a teacher.

The teaching mode: a session in a few clicks

This is the heart of the matter. You choose a class, a level, an operation, a game mode, and a large code is displayed on the screen. Students enter it on their station or tablet, or click on the room detected automatically on the local network. Everyone gets the same questions, and you follow a real-time ranking during the activity.

This principle of the challenge projected in the table will remind something to those who already use I can’t have math, with its teacher mode for the rituals of the beginning of the session. The difference here: students respond directly on their device, and the score goes up on its own.

At the end, you get a pedagogical report exportable in CSV and PDF. Convenient to keep track of sessions and track the progress of your students.

Reassuring detail: in class mode, everything remains on the school’s local network. No pupil data leave the school. We'll go back down there.

Modes designed for different student profiles

The variety of fashions is not just cosmetic. Problems mode offers contextualized statements. The Division asked breaks down each step as on a notebook and checks the answers in real time, useful to anchor the operating technique. Training also makes it possible to target a specific operation, in the mind of an exerciser such as Challenge Tables for multiplication tables.

And then there's the Quiet Mode that I really enjoyed. No time, no combo, no score: Just time to think. It targets the youngest, the dys-students and all those whom the pressure of the timer blocks rather than stimulates. This is typically the kind of detail that shows that the publisher listens to its users.

Other attention for vulnerable pupils: the Lexend font, designed to make reading easier for young readers and Dys students, as well as a colour-blind mode with several settings.

Collective emulation: War of the Schools and Battle of Classes

This is the most original playful angle. The Battle of Classes pits two classes against each other, with each student seeing their contribution to the collective score. The War of the Schools broadened the principle between schools.

The idea of a collective challenge is not new. The National Competition Mathador has for years been based on the same motivational spring by the entire class. Calcul Mental Challenge offers a permanent version, to launch whenever you want. On paper, one might fear the sterile point race. In practice, the idea remains rather a lever for collective motivation. Encouraging students to come back without turning the calculation into a permanent competition.

Instructions for use: start a class session

Concretely, here is how to launch your first activity.

1. Install the app on the teaching station (Windows or Mac).
2. Install it on student workstations or tablets. Everyone has to be on the same local network.
3. Create your session. Only one form: class, level, operation, game mode.
4. Display the code on the table. Students enter it or click on the automatically detected room.
5. Throw it. All receive the same questions, the ranking is displayed live.
6. Analyze. At the end of the session, consult the balance sheet and export it if necessary.

The software requires a local installation, to be anticipated according to the connection of your establishment. The publisher announces a deployment in less than 10 minutes. Then allow a few seconds to prepare for each subsequent session.

Calculating Mental Challenge versus other tools

Online mental calculation does not lack good resources. Here is how to situate the application in relation to tools already presented here.

The application does not overwrite anyone. Calculatice remains an online reference with nothing to install, and Matheros shines by its progression in belts for the primary. Computing Mental Challenge is distinguished above all by its amplitude of levels and its offline operation in the classroom.

What I like

Real gratuity, without advertising or in-app purchase, is to be welcomed: this has become rare for such a supplied application. The data approach is reassuring, with a strict LAN class mode. Coverage of CE1 in high school is unusual. And the attentions for students who are dys or in difficulty (Calm Mode, Lexend font, colorblind mode) show a real pedagogical concern.

What I like less

The application must be downloaded and installed: No browser version to test in two clicks, unlike Calculatice. Local installation and the need for a common network can complicate setting up in poorly equipped establishments. Finally, the abundance of modes and playful elements may sometimes distract the youngest from the goal.

Should it be adopted?

If you are looking for a free, comprehensive mental calculator that respects your students' data and can set an entire class in motion, Calcul Mental Challenge is worth a visit. Installation requires a small initial effort, but class mode saves time once in place. To be tested on a sequence of rituals, to see if emulation takes place in your class.

Link: Calculation Mental Challenge