To find and use the PayPal currency calculator, you need to log into your account and open your "Wallet" page.

There are two basic ways to do fractions on your iPhone calculator. Here's what you need to know to use the built-in app.

Apple's Calculator app does more than help you calculate tips. With the latest OSes, it launches on iPad and lets you create a Math Note for more complex problems, among other things. Lance is an ...