mPustak Subtract (320x240 360x640) is a Mathematics Practice app that helps you learn with a lot of fun! Practice simple subtraction questions and compete against yourself for score and time!
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TouchMaths_ME The program TouchMaths (for touchscreen mobile phones) contain a set of revolutionary mathematical applications (Professional Calculator, Graph 2D, Function solver, Integral solver, Equation solver and Linear system solver)
Algeo calculator With Algeo, you can easily plot functions, find their intersections, derivatives, etc. You can solve equations as well. Some other features: calculates Taylor-series, builtin hyprebolic functions, and matrix operations
HexNumber This is a number converter. You can enter a decimal, hexdecimal, binary or octal number and see what it is in the other formats. The full version has a very much better interface plus you can convert to and from any base, it's available only for 0.5$