Here’s a quick way to figure out a tip or do a quick calculation with your Android phone. Tap the Google Now Widget and either say “Okay Google” or tap the microphone.
Then ask the question such as “What is 15 percent of $29.37?” Make sure to say “Twenty-nine dollars and thirty-seven cents.”
Google now will then calculate your tip. You can also split up the bill by the number of people to show your portion.
It can do other basic math calculations as well, including metric conversion and square roots.