價格：免費
更新日期：2018-12-26
檔案大小：1.8M
目前版本：1.3
版本需求：Android 6.0 以上版本
官方網站：mailto:freud.hans@yahoo.com
This game aims to help elementary school students to learn simple subtraction through practice. You can select the level of difficulty from the menu.
Level 1: Subtraction through 10
Level 2: Subtraction through 18
Level 3: 2-digit subtraction with no renaming
Level 4: 2-digit subtraction with renaming
Level 5: 3-digit subtraction with non renaming
Level 6: 3-digit subtraction with renaming
Level 7: 4-digit subtraction with renaming
