Apps in this category may contain mild or occasional cartoon, fantasy or real-life violence, as well as occasional or mild adult, sexually suggestive or horrifying content and may not be suitable for children under 9 years of age.

12+

Apps in this category may contain occasional mild indecent language, frequent or intense cartoon or real-life violence, minor or occasional adult or sexually suggestive material, and simulated gambling, and may be for children under 12 years of age.

17+

You must be at least 17 years old to access this App.

Apps in this category may contain frequent and intense offensive language; Frequent and intense cartoon, fantasy or realistic violence: frequent and intense adult, scary and sexually suggestive subjects: as well as sexual content, nudity, tobacco, alcohol and drugs, may not be suitable for children under 17 years of age.

Math Agility 螢幕截圖

iPad

iPhone

About Math Agility

Measure and increase your math agility with this arithmetic speed game.

The rules are simple: the app will give you a math problem to solve and you have 20 seconds to do it.

Sometimes the problems are easy, like 2 + 2. Othertimes they are evil and mean, like 47.1 ÷ 721 (that's 0.0653 by the way).

Sounds hard, huh? It is. So the app is kind and gives you partial credit: you're graded on bell curve around the answer. This means you can be a little wrong but still get partial credit.

The trick is to develop the ability to solve seemingly very difficult math problems in your head using successive approximations. First get the order of magnitude right, then the next digit, then the next.

Once you develop this skill, every day problems will be a pleasure to solve and you'll be the first one in your group of friends able to split the check (sorry).

This app is great for engineers, scientists, students, and the rest of us who just want to keep our brains working well.

I hope you enjoy it!