The app students actually ask their teachers for. From 1st grade to high school, solo or in class — with duels, badges and zero ads.
A few screenshots of the app on mobile and desktop
Each mode trains a different mental math skill
20 questions adapted to your level. 6 game styles: Normal, Endurance, Expert, 3 Lives, Time Attack and Exam.
Practice your addition, multiplication or division tables. Choose the table (1 to 15) and the session style.
Contextual word problems inspired by school textbooks. Adapted from 1st grade to high school.
6 worlds to explore: Forest, Volcano, Ocean, Desert, Space and Abyss. Beat the bosses and unlock rewards!
A crossword-style math puzzle. Place numbers so that all equations are correct.
Find the missing number in the sequence: 2, 4, ?, 8. Fibonacci, primes, geometric and more.
Solve systems with 2 unknowns. From 1st grade (one unknown) to high school (full systems).
Follow a chain of operations: 12 → +5 → x2 → -3 → ? Train your pure mental math.
Questions get harder, time gets shorter. One single mistake and it's over!
Play a game, copy your code and send it to a friend. They'll play the same questions and compare scores!
Learn to set up a division step by step, just like on paper. The app breaks down each step and checks your answers in real time.
Build your tower floor by floor. Each correct answer adds a floor, each mistake weakens the structure. How far can you go?
Create a classroom session in 30 seconds, track your students in real time
Choose the class, level, operation and game mode. Just one form.
The code is displayed in large text. Students type it in or click the detected room.
All students receive the same questions. Live leaderboard in real time.
Average score, accuracy, final ranking. CSV and PDF export with detailed reports.
No data leaves the school. The server runs on the teacher's computer.
The Windows firewall rule is added at installation. No manual configuration needed.
Students see the room automatically. Or scan the QR code / type the code if needed.
I'm Laurent BOST, a school IT worker and dad of two kids in France.
I built Mental Math Challenge because every math app I tried for my kids was either full of ads, too basic, or paid after 5 minutes. So one Sunday afternoon I started coding a simple multiplication quiz. My son loved it. Then he wanted to play against his sister. Then against his class. Then against the school next door.
Today, teachers use the app in their classrooms to run mental math sessions. It's still 100% free, no ads, no tracking. Because kids deserve better than ads between divisions.
— Laurent, developer and dad of two demanding testers
Free, no ads, no account required
🔒 Automatic updates (desktop) • 🔥 Firewall configured automatically (Windows)
💡 Teachers: install on the teacher's computer (Windows/Mac) AND on student devices (desktop or mobile). Same WiFi network required.
📱 Mobile: Teacher mode is available on mobile (class management, student QR scanning, sync with the classroom computer). Session launch is done from the computer.
Mental Math Challenge in the educational media
Are you a journalist or education blogger? Contact us: contact@studiophel.fr
Websites and resources for math education in schools
Know a quality educational resource? Suggest it!