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https://abacusmastercanada.com/
An abacus is a simple tool used to perform rapid arithmetic calculations that was invented thousands of years ago. An abacus consists of a rectangular frame with a number of vertically arranged rods, each with a number of beads that can freely slide up and down. The beads, rods and movements of said beads, represent numbers, place values, and various arithmetic calculations, respectively.
https://abacusmastercanada.com/
An abacus is a simple tool used to perform rapid arithmetic calculations that was invented thousands of years ago. An abacus consists of a rectangular frame with a number of vertically arranged rods, each with a number of beads that can freely slide up and down. The beads, rods and movements of said beads, represent numbers, place values, and various arithmetic calculations, respectively.