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May 1, 2025
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jan 1, 500 BC - Abacus

Description:

What: A manual aid to calculating that consists of beads or disks that can be moved up and down on a series of sticks or strings within a usually wooden frame.
How: You move the beads to calculate basic math

Added to timeline:

Date:

jan 1, 500 BC
Now
~ 2527 years ago

Images: