PhotoMath by microblink uses a phone’s camera to solve equations and then teaches you the step-by-step method for solving it yourself.

The app can do arithmetic: addition, subtraction, division and multiplication. It can handle fractions. It knows what 23 is and can calculate the root of 246. It can even do simple linear equations, provided the x you’re solving for is italicized so the app doesn’t confuse it with the x multiplication symbol.

Hint, Hint Teachers: The only catch is that the equation you’re trying to solve must be printed text, rather than handwritten.

The PhotoMath app is available for iPhones and Windows phones and is coming to Android phones in 2015.