This app was removed from the App Store.
iOS iPhone Education
A calculator that only requires 2 inputs. Six categories: basic calculations, fraction conversions, percentages, triangles, areas, and powers/logs. 27 different calculations simply shown.
To try before you buy or for classroom use just visit the website.
Also available: Factorisation Trainer, Straight Line Trainer, Logarithm Trainer, Integer Trainer, Trig Trainer.