Some people call the abacus a "counting frame," as it was developed as a tool to help with calculations prior to the invention of written numbers. There are examples of abici that were made of beans, stone and/or sand.
While the abacus is not as popular as it once was, it is still in use in some areas around the world as a tool for learning to calculate many numbers at once. The abici that are made today are typically made of beads, wire and bamboo.
If you want to see some modern kids doing some fantastic calculations using abici, watch the video below.
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