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.

Unlock the full potential of your iPad calculator app with our beginner's guide on how to use math notes on iPad. See how it can automatically calculate math equations and show results as you write.

Imagine Math is a digital program that combines a rich curriculum with fun, adaptive experiences to engage students and help them become confident math learners.

There's a new Guinness World Record holder for how fast someone can do math. Aaryan Shukla -- who has been dubbed "the human calculator" can solve complex problems in his head in seconds.