I also did something very similar: https://play.google.com/store/apps/details?id=com.simplyapped.calculate https://play.google.com/store/apps/details?id=com.si

I also did something very similar: https://play.google.com/store/apps/details?id=com.simplyapped.calculate https://play.google.com/store/apps/details?id=com.simplyappe... It's supposed to be like the "numbers" round from the show Countdown in the UK.