Apple Support on Twitter: "Ask Siri to convert a measurement while you're cooking. You won't even have to rinse the dough off your hands. See what else you can do with Siri:
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Need to Do Some Simple Math? Get Siri to Do It! - Mac Business Solutions - Apple Premier Partner
Good thing Siri is now powered by the lates “Bionic” chip, so it can tackle complex math : r/SiriFail
PCalc 3.8 Adds Support for iOS 12's Siri Shortcuts, Including Powerful Clipboard Commands - MacStories