價格：免費
更新日期：2014-01-15
檔案大小：2.8M
目前版本：1.3.1
版本需求：Android 2.2 以上版本
官方網站：http://www.primesrus.com
Email：support@primesrus.com
Twentyfour Challenge is a game to sharpen your mental math skills. Choose one of two pairs of numbers and then use *, /, +, and - to produce the challenge number. App keeps track of game score and saves high game scores.
Features:
o Appropriate for math students of all levels.
o Teaches operation order and precedence
o Multiple levels of difficulty with hints
o Best of all it's free with no advertising!