Chinese abacus counting frame, a calculating tool that was in use in Europe, China and Russia, centuries before the adoption of the written Hindu-Arabic numeral system. Th - Album alb9064788
Vecteur Stock European abacus counting frame. Calculating tool with rainbow colored beads sliding on wires. Used in pre- and in elementary schools as an aid in teaching the numeral system and arithmetic
In which countries is an abacus used? - Quora
File:Positional decimal system on abacus.JPG - Wikipedia
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