2020 update – Have you tried PhotoMath? Some of my Sixth Form students were checking some integration examples using this recently, it seems very easy to use and for the examples I tried looked very helpful.

PhotoMath

PhotoMath is a free camera calculator phone app available on Android as well as iOS and Windows. To use point the camera towards a printed mathematical expression and the app gives the solution, step ­by ­step solutions are also available. Problem types are  shown in the examples here and it can be a bit tricky to focus the camera sometimes, particularly where problems are very close together on a page but this is rather clever! The app supports handwriting recognition.

Photomath Examples

Experimenting, I have found that the app works if you point the camera at a screen, so one could zoom to an appropriate size first. Try these equations in the Year 7 text on CIMT for example:

CIMT Linear Equations

Select for video demonstration on Vimeo