TowerCalculator+ в Android Market

TowerCalculator+ (v. 1.10) Разработано Oliver Jedinger

With this tool you can calculate a tower.

For example

2 * 2
4 * 3
12 * 4
... up to *9 and then divide
144 : 8
18 : 9
2


and so on.

You can use TextToSpeech so that it tells you the digits. (for example in school)