xmem (com.suphi.xmem) on Google Play
This app will help you memories the times table.Best to start with (1-5 / 1-5)then (6-9 / 6-9)then (1-10 / 1-10)then (1-12 / 11-11)then (1-12 / 12-12)etc..Try not to work out the result but try to remember the result. If you have a strong visual memory try to remember where your fingers press then you can visualize the keypad without the app.