Mental Math Master - The complete guide to mental arithmetic
This may be the software you are looking for. One of the cds is called mental math samurai and looks like it has someone doing karate on the cover .
I am not familiar with this software, I merely pride myself on my ability to use google quickly and effectively.
One search attempt and one redirect from another site led me to the above address. If it is correct, SCORE! If not it might still be useful to help you master your mental math... or mentally master math... or mathematically master your mentality .