FORT LEE — For 10 seconds, a series of 50 random three-digit numbers flashed on the screen. After another second, abacus master Jeonghee Lee announced she'd finished the mental addition, correctly ...

Ever dreamt of solving math problems in your head with the speed of a calculator? Mental math might seem challenging, but it's a skill attainable through the right tools and techniques. The abacus, an ...

Converting between kilometres and miles doesn't have to be a mathematical nightmare. Whether you're preparing for competitive exams, trying to understand American movies and TV shows, or working on ...