First appearing around 1200 A.D. in China, the modern abacus evolved from the counting boards that dated back to Babylonian civilization. Featuring rods of vertical beads split across two decks, the abacus serves as a tool that still finds use in many Asi

How to use an Abacus for Subtraction? The next operation which you will learn is, how to use an abacus in a step-by-step method to perform subtraction? Subtraction is just the reverse process of addition. All you need to do is borrow the digits from the p

To use an abacus to add, first orient it by pushing 1 or 2 beads to the top of each row and 4 beads to the bottom of each row, which will set it back to zero. After you’ve oriented it, assign each a column a place value. For example, the furthest column