11 sept. 3001 av. J.-C. - Abacus
Description:
The Abacus was used in Babylon 2000 years before the Greeks used it to help with calculating. To use it, you slide the beads up and down on the rods to add and subtract. It is used today in some countries.Ajouté au bande de temps:
Date:
11 sept. 3001 av. J.-C.
Maintenaint
~ Il y a 5030 ans