Interactive Brain Lab
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Interactive Soroban Lab

Virtual Abacus Simulator

Tap the beads below to practice Soroban place values. Push upper beads down (value 5) or lower beads up (value 1) toward the beam.

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How to Use: Upper deck bead = 5 (push down towards middle beam). Lower deck 4 beads = 1 each (push up towards beam).

Understanding the Japanese Soroban Abacus

Invented centuries ago and refined into the world's most efficient brain training device.

1. The Reckoning Beam (Separator)

The horizontal bar dividing the frame. Beads have value only when they are moved towards this beam. Any bead pushed away from the beam is neutral (inactive).

2. Upper Deck: Heaven Beads (Value = 5)

Each rod has 1 bead in the upper deck. When pushed down against the beam, it represents 5. When pushed up away from the beam, it resets to 0.

3. Lower Deck: Earth Beads (Value = 1 each)

Each rod has 4 beads in the lower deck. Each bead pushed up to touch the beam adds 1. All 4 beads up = value 4.

4. Place Values (From Right to Left)

The white reckoning dots mark the units column. Moving left: Tens, Hundreds, Thousands, Ten-Thousands, Hundred-Thousands.

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