Mencal - Mental Math Tricks App Reviews

A very good one. It tells the easy and useful methods when doing simple calculations.

The keypad can include arrow keys to edit.

不错，题目很有趣味

I suggest starring the ones you're most likely to need. The app taught me there are a lot more shortcuts to math than I expected.

You just have to devote time do the application and do examples over and over and over again. With time your master these exercises. Your mastery will save you a lot of time.

希望类似的心算可以放在一起

To keep your brain in 4/3 πr ³