Mental Math Master в Android Market

Mental Math Master (v. 1.0.7) Разработано droidprofessor.com

After purchase, start the application
1. Press "Menu->Upgrade"
2. Press "Login/Register", create a new account or login to an existing account.
3. Select "Android Market" as the payment method
4. Press "Proceed"
5. Accept the condition and then press the "Get License" button.

This is the upgraded version of Mental Math Master offering more lessons.

If you have not already done so, you should first try out the free version "Mental Math Master Lite" before you purchase.