3n or Not 與 Math Training - Calculation - 使用情況與統計
3n or Not is a game to quickly discrimination whether that number is a multiple of 3 or not.
- Apple App Store
- 免費版
- 教育
商店排名
- -
You can choose levels you like from various levels of problems.
This is helpful for abacus training, too.
- Apple App Store
- 免費版
- 教育
商店排名
- -
3n or Not VS. 
Math Training - Calculation -1月 8, 2025