Abacus

My dad taught me how to use the abacus when I was young. The abacus my dad used was almost as big as a standard keyboard. I particularly like the clacking sound produced by the seeds knocking against one another. Subsequently, I joined my primary school Abacus Club but that was when I lost interest in abacus too. It had become a competitive and stressful experience when the students tried to compete with one another to see who was the fastest to come back with the correct answer.
Look carefully at the way the fingers are bent when pushing the seeds. That was how I was taught to position my fingers too, which I believe should be the correct way.