Abacus

An abacus is a manual calculating tool that uses a series of rods with beads to represent numbers. Each bead's position indicates a specific value, allowing users to perform basic arithmetic operations like addition, subtraction, multiplication, and division. Originating thousands of years ago, it functions as a visual and tactile aid, helping users understand number relationships and perform calculations without electronic devices. While less common today, it remains an effective educational tool for developing fundamental math skills and mental calculation strategies.