3n or Not vs Math Training - Calculation - Usage & Stats
3n or Not is a game to quickly discrimination whether that number is a multiple of 3 or not.
- Apple App Store
- Free
- Education
Store Rank
- -
You can choose levels you like from various levels of problems.
This is helpful for abacus training, too.
- Apple App Store
- Free
- Education
Store Rank
- -
3n or Not VS. 
Math Training - Calculation -January 8, 2025