There are many awesome calculator and math apps available for iOS and Android devices. PhotoMath is quite unique though. It lets you use your smartphone camera to capture equations and get answers to the problems you simply can’t solve. By pressing the steps button, you get the step-by-step solution, so you can learn something in the process. PhotoMath supports basic arithmetic, fractions, decimal numbers, linear equations and various functions. Just bring your smartphone, and you are set.