An abacus is an ancient kind of calculating machine that keeps track of numbers by moving beads in grooves or along bars.
Give me an example!
The abacus was invented in ancient China - and is still in use there today! The abacus is recognized as a working part of the mathematics curriculum in many parts of China - although most younger people prefer calculators. The great thing about an abacus is you never have to worry about running out of batteries!
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