Mental Math tests your arithmetic skills without tracking your every move.

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Mental Math is a free, open-source Android app written in Kotlin that helps users improve arithmetic skills through customizable math problems. The app offers two game modes (Task Mode and Timed Mode), nine difficulty levels, and supports all basic operations. It collects no data, requires no permissions, works offline, and includes features like performance tracking, score sharing, and game history. Available on F-Droid, Play Store, and Codeberg.

This Open Source Android App Fights Brainrot With Basic Math Problems