Starting the Game
Left click or tap anywhere to begin.
Read the rules of the soroban on the left side of the screen.
Game Controls
Desktop
With your mouse, left click to select.
Touchscreen devices
Tap on the screen with your fingers to select.
Controls and indicators:
The instructions and history of the soroban are shown on the left column.
The right box shows the following options:
The number box is on top of the screen. Above it is a number display.
The check button checks the value of your input.
The reset button brings back the soroban’s values back to 0.
The randomize button generates a random number, which is expressed in the soroban.
The eye button toggles the visibility of the other buttons.
The Try a Challenge button begins the challenge.
Game Play
Basic rules
Much like Arabic numbers, the place values are shown from left to right.
The soroban’s place values express 10.
The soroban in this game has place values up to the ten thousands.
To express a number, work from the largest values downward.
The values of the soroban are based on how close they are to the middle bar.
The beads on top section have a value of 5.
The beads on the bottom section have a value of 1.
To express a number, move the needed number of beads to the middle bar.
To mark a place value as 0, simply move the beads closer to the edges.
To calculate with a soroban, express one number, and then move the beads around. Count the place numbers
Display and challenges
Choose the randomize option on the box to generate a number in Arabic numerals, which will also be expressed in the soroban. Hit this a few times to familiarize yourself with the placement of the numbers
Move the beads around yourself to form various numbers. The game will display the number’s value in Arabic numerals on the box.
Use the number box to input a number represented in Arabic numerals on the display.
You can input this using the arrows on the right edge of the number box or using the keyboard if you’re on a desktop.
The game automatically moves the beads to match the numbers.
To see if you can express numbers yourself, hit the Try A Challenge option.
The number you need to express will be shown on the box.
Move the beads around until the match the number on the box.
Select the check button to see if you got it right.
The box will shower x’s if you get it wrong and checks if you get it right.
