MyScript Calculator 2

Works great. Very flexible as well.

This app is far more convenient than a standard calculator for simple "back of the envelope" calculations, such as adding VAT., as well as for many more mathematical operations involving fractions, powers, roots, trig functions, etc. This is because entry is via finger, rather than keyboard. It could be made even more useful if it were extended to recognise sigma and pi expressions for symbolic sums and products.