價格：免費
檔案大小：4.9 MB
版本需求：系統需求：iOS 6.1.6 或以後版本。相容裝置：iPhone、iPad、iPod touch。
支援語言：英語
Sharpen your mental math skills with Operation 99! Choose an operation - either addition or subtraction - and test your speed on solving each problem. Tap the number tiles to add or subtract their values respectively. You have 10 seconds to solve each problem correctly.The problems are endless, how many can you get correct?
Can you last 99 seconds?!
...Math was never this fun...
