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Decimal system
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Ancient bamboo slips for calculation enter world records book

A set of bamboo slips dating back more than 2,300 years were officially recognized Sunday by the Guinness Book of World Records as the world's earliest decimal calculation tool. The 21 slips, crafted around 305 BC during the Warring States Period, are 43.5 centimeters long and 1.2 centimeters wide each.
When arranged together as a multiplication table, the slips can perform multiplication and division of any two whole numbers under 100 and numbers containing the fraction 0.5.

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