Question

describe the working of abacus​

Answer 1

Answer:

it was the first calculating device. it was used in ancient Rome for calculations.

Answer 2

Abacus tool is actually a calculator. The horizontal black bar sperates all the beads into the lower beads and the upper beads. All upper beads have the value of 5 and all the lower beads have the value of 1. When any of the beads touches the horizontal bar, a number is formed.

hope it helps........