10 seconds of math is described as 'Practice mental arithmetic' and is a Math Game in the education & reference category. There are more than 25 alternatives to 10 seconds of math, not only websites but also apps for a variety of platforms, including iPhone, Android, iPad and Android Tablet apps. The best 10 seconds of math alternative is Mental Math - By Mental-Math, which is both free and Open Source. Other great sites and apps similar to 10 seconds of math are Magrid, Freaking Math, Arithmatastic and NumberDrop.