價格：免費
更新日期：2017-06-12
檔案大小：3.4 MB
目前版本：5.0
版本需求：需要 iOS 10.2 或以上版本。與 iPhone、iPad 及 iPod touch 相容。
支援語言：英語
StarSum is a game to practice addition and subtraction of 2 digits. It contains 4 expressions. Each expression has 3 operands and 2 operators.
There are 4 circles along the right side. These circles show the results of these 4 expressions.
1. The top 2 circles show the results for the top pair of 2 expressions.
2. The bottom 2 circles show the results for the bottom pair of 2 expressions.
3. The goal of this game is to swap the operands to make the top 2 expressions have the same results and the bottom 2 expressions have the same results.
4. The player could choose to practice plus only or the combination of plus and minus.
5. It supports 5 levels.
Level 1: the player needs to swap 4 operands.
Level 2: the player needs to swap 5 operands.
Level 3: the player needs to swap 6 operands.
Level 4: the player needs to swap 7 operands.
Level 5: the player needs to swap 8 operands.
支援平台：iPhone, iPad