Ha! I use a Casio emulator as my main calculator https://play.google.com/store/apps/details?id=advanced.scientific.calculator.calc991.plus https://play.google.

Ha! I use a Casio emulator as my main calculator https://play.google.com/store/apps/details?id=advanced.scientific.calculator.calc991.plus https://play.google.com/store/apps/details?id=advanced.scien...