Abacus is a calculating tool which first originated in the European countries. However, it was in China where Abacus became popular and was used for day to day calculations. Predominantly, used as a calculating tool, it has a frame consisting of wires which are attached to frame and beads which slide along these wires. Each bead represents one unit.
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One important lesson Math that we can all apply in our lives is ”Always Be Careful With The Signs!”