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ABACUS

An abacus is a hand-operated calculating tool that uses beads or counters that slide along rods or grooves to perform mathematical functions. It’s also known as a counting frame. 

We cannot imagine counting without numbers, but there was a time when written numbers did not exist. Earlier counting devices that were used for counting are the human hands and their fingers that are capable of counting only up to ten. Toes were also used to count when they had to count more than ten. A larger quantity was counted, with the help of natural items like pebbles, seashells and twigs. Merchants who used to trade goods needed a way to keep count of the goods they bought and sold.