How to use iSoroban

Let's see how to do "52-31=21".

iSoroban First, place 52 on iSoroban.
iSoroban To subtract 30, move 5 bead up and add 2 beads on the 10s column.
iSoroban Then move 1 down.
Now you see 21 on your iSoroban.

iSoroban main | Overview | Addition | Subtraction | Multipliction | Division

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