Use as a Calculator
Long for the days of your Casio Calculator watch? You can use a calculator app on the Apple Watch to solve simple math problems and figure out how much to pay for the tip.
Of course you can also use Siri for these features, but no one wants to be the guy asking his watch how much to tip out loud in a busy restaurant. Calcbot is a handy option that can even convert currency for you.
This article may contain affiliate links. Click here for more details.