價格：免費
檔案大小：3.3 MB
版本需求：需要 iOS 2.2.1 或以上版本。與 iPhone、iPad 及 iPod touch 相容。
支援語言：英語
Fun and intuitive way to introduce double digit addition and subtraction.
The animated numbers show how the carry over works. In no time your child will start doing double digit operations even without realizing it.
Features:
1) Single digit Addition and Subtraction
- 5 levels gradually increasing in difficulty
2) Concept section (little bulb in top left corner of main screen)
- Explains the units and tens position
3) Double digit Addition and Subtraction
- Level 1: Without carryover
- Level 2: With carryover
支援平台：iPhone