What is mobilematics? An app written for Android phones, meant as a useful calculator and mathematics utility. It can replace your need for an expensive graphics calculator, with many innovative features to boot:

• Teacher mode: can invent questions and test you on them
• Made for everyone: basic calculations to advanced maths
• Converter: converts between all major units, as well as currencies
• Plots graphs - cartesian, polar, parametric, statistical
• Calculus: symbolic differentiation (multivariate), integration, limits, sums
• Solve polynomials, general equations, matrix equations, simultaneous equations..
• Statistics - can easily manipulate data
• Complex numbers are supported
• Much more..