An abacus is an ancient tool used for counting, consisting of a framed set with rods on which balls or beads are moved. The abacus has been in existence in China since the second century BCE, although ...

The abacus has taken many forms over the centuries. In Medieval and Renaissance Europe, merchants commonly did calculating by moving wooden or metal counters along lines drawn on a wooden table known ...

Realising that he needs to count more than 10, he has the idea of making an unusual abacus that goes up to 20, and uses toy cars instead of balls. He grabs a washing line and creates his ...

How to use the abacus became a compulsory subject at elementary schools in Japan in 1935. Today, soroban lessons are included in math classes for third- and fourth-graders. In 1986, there were ...