A virtual soroban
On this page, you can find a virtual soroban to help you learn and practice the soroban or japanese abacus. You can customize its appearance by changing the variable in the url:
- To change the size, use the
sizeparameter. It specifies the number of columns.
- To disable the grey out of the beads, use
- To colorize beads that are going to be moved, use
- To control the speed of the movement of the beads, use
timeout. The value is in milliseconds.
A mental calculation page
It's a full screen page that allows you to practice anzan a.k.a mental calculation. Numbers are said out loud by a speech synthesis voice. It lets you focus on the soroban you draw in your mind.
But you can also use this page to practice the soroban, a real one this time, by using higher value for the digit parameter.
It should be mobile friendly.