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Mental Math

Practice mental arithmetic solo or compete with friends.
New in version 17
- display app version under the logo in the menu
- click of logo leads to the release entry for current version on codeberg
- fixed small issues in the description
"Mental Math" is a simple and clean Android app for mental arithmetic training. You can practice on your own or challenge friends to compete and improve your skills. The app is open source and respects your privacy.

Customizable Training
Select which arithmetic operations to include (+, −, ×, ÷). For each operation, choose from nine difficulty levels to customize your training precisely to your skill level.

Two Game Modes
• Task Mode lets you complete a fixed number of tasks (10, 20, 30, 40, or 50).
• Timed Mode challenges you to solve as many tasks as possible within a time limit (1, 2, 3, 4, or 5 minutes).

Challenge your Friends
You can share a game link to:
1. Replay a completed game with the exact same tasks to compare scores with friends.
2. Start a new game with preset settings for a fair and fresh challenge for everyone.

Difficulty Calculation
Task difficulty is determined using algorithms based on column addition, column subtraction, long multiplication, and long division, creating realistic and well-balanced exercises.

Detailed Results
After each game, view a detailed summary that includes your selected settings, your performance (accuracy, speed, and score), and a complete list of all your tasks and answers for review.

Personal Leaderboard
Your top 10 results are displayed separately for each combination of settings, allowing you to easily track your progress. You can also review detailed summaries of your top games at any time.

Game History
Explore the complete history of all your scored games. You can sort the list by time or numerically to find specific games. Anytime, you can revisit any match to view a detailed summary of its results.

Clean Design
A simple and minimalist app design with no unnecessary elements or distractions, designed to keep your focus fully on mental math training. Supports both light and dark modes.

Open Source and Privacy
"Mental Math" is fully open source, free to use, and does not collect or process any personal data. It requires no permissions, contains no ads, and runs entirely offline to respect your privacy.

Versions

Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.

Download F-Droid
  • Version 17 (17) suggested Added on Dec 03, 2025

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 7.0 or newer.

    It is built and signed by the original developer, and guaranteed to correspond to this source tarball.

    Permissions
    • com.helddertierwelt.mentalmath.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 10 MiB PGP Signature | Build Log

  • Version 16 (16) - Added on Dec 01, 2025

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 7.0 or newer.

    It is built and signed by the original developer, and guaranteed to correspond to this source tarball.

    Permissions
    • com.helddertierwelt.mentalmath.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 10 MiB PGP Signature | Build Log

  • Version 15 (15) - Added on Nov 29, 2025

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 7.0 or newer.

    It is built and signed by the original developer, and guaranteed to correspond to this source tarball.

    Permissions
    • com.helddertierwelt.mentalmath.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 10 MiB PGP Signature | Build Log