This app helps younger kids to practice simple mathematical operations:
• One and two digit additions without carry;
• One and two digit subtractions with the minuend greater than the subtrahend .
It aligns and highlights the digits in order to help the learning process. Sounds and scores help to motivate to keep practicing.
It has a high contrast mode and supports TalkBack for visually impaired children.
The app is open source, its code is hosted on GitHub.