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INTERACTIVE SOROBAN ABACUS
Click beads to slide them — Heaven bead = 5,
Earth beads = 1 each.
Tab to focus • Space / Enter to toggle bead • Arrow keys to navigate between beads
MATHS WORKSPACE
Solve & Practise
Draw, write, and calculate directly below the abacus.
RULES PASSWORD MODAL
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Soroban Abacus
Rules & Guide
Official Operating Principles
1. Bead Values & Placement
- Heaven Bead (Upper Deck): 1 bead per rod, value = 5 when moved down towards the beam.
- Earth Beads (Lower Deck): 4 beads per rod, value = 1 each when moved up towards the beam.
- Active State: Beads only count toward value when touching or
sliding towards the central divider beam.
2. Rods & Unit Dots
- Center Red Dot: Placed at the central rod representing the
primary Units place value.
- White Unit Markers: Positioned every 3 rods to mark Thousands,
Millions, etc.
- Draggable Markers: Unit dots can be pressed and dragged to any
rod center to customize place-value alignment.
3. Controls & Shortcuts
- Reset & Clear: Resets all beads across all rods back to their
zero position.
- Keyboard Navigation: Use Tab to
focus beads, Space
or Enter
to toggle, and Arrow
Keys to navigate.
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