Windows 10: Use the Cortana search to perform quick calculations

One of Cortana's many features is that you can use it to perform quick calculations, such as:

• How many ounces are in a pound?
• What’s the square root of 578?
• 1 USD to CAD (or 1 US Dollar to Canadian Dollar) [most currencies are supported]

Note: These searches will also work in Google and Google Now