Abacus-(soroban)

                                     

BEAD TYPES

The beads above the crossbar are known as heaven beads, and 

those below the crossbar are called earth beads.

BEAD VALUES

Each bead in the upper deck has a value of 5; 

each bead in the lower deck has a value of 1.

Can Perform 1)Addition 2)Subtraction 3)Multiply 4)Divide