- Tsinghua Bamboo Slips
- 2,300 year(s)
- China Mainland ()
The oldest decimal multiplication table is the twenty-one bamboo slips of the Tsinghua Bamboo Slips from around 305 BC which were acquired by Tsinghua University (China) in 2008.
The Tsinghua Bamboo Slips are a collection of Chinese texts dating to the Warring States period and are written in ink on strips of bamboo.