AsianIdeas

From the Greek word abax, meaning "calculating board" or "calculating table," the Chinese abacus was invented during the Yuan Dynasty, 1280-1368 AD. Often referred to as the first computer, the abacus is used to add, subtract, multiply and divide, as well as figuring fractions and square roots. Learn how to add, subtract, multiply, and divide with our Abacus Instruction Booklet. 31 pages.
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