Calculator abacus

Features Calculator abacus

The calculator is a simple calculator of only four arithmetic operations .Transformed into a abacus if the terminal next to .Since the number at the bottom is displayed in accordance with the position of the ball it can also be used in the practice of the abacus .
If you want to use as a calculator , you will see the calculation results at the top of the abacus .Because even in the display when the calculated result is negative supports ,The answer alignment of Mitorizan so you can determine the position of the ball is recommended to practice for beginners .