On Debian (and, I'm sure other distributions of GNU/Linux) the 'bsdgames' package contains a simple program called 'arithmetic' which poses similar challenges,

On Debian (and, I'm sure other distributions of GNU/Linux) the 'bsdgames' package contains a simple program called 'arithmetic' which poses similar challenges, albeit reduced to the most elementary operations: addition and substraction. Call as arithmetic -o '+-x/' in order to add multiplication and division. I find it a handy supplement to 'gtypist' in order to train touch-typing of numbers. On a side-note: I'm surprised at how scarce such software is - pitiful as it may be. But then, the advancement of the human intellect isn't at the forefront of our cultural conscious, is it?