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Fun with Numbers (Smart 100-Bead Abacus & Place Value Counter)

Source:

Slide metallic beads along 10 parallel wires of an abacus. Conductive touch tracks detect bead positions, displaying the exact number (1-100) on a 7-segment digital display and speaking the place value expansion.

Categorisation

Props & Materials Required

  • •Wooden frame abacus with 10 wires (10 beads per wire)
  • •Metallic/conductive beads or foil-wrapped beads
  • •ESP32 / Arduino Nano controller
  • •Copper tape contact rails behind wires
  • •4-digit 7-segment LED display
  • •DFPlayer Mini MP3 module + 3W speaker

Step-by-Step Instructions

1

Slide Beads for Tens

Slide 4 full rows of 10 beads to the right. The digital display updates to '40'.

2

Slide Beads for Ones

Slide 7 individual beads on the 5th row. Digital display reads '47'.

3

Press Audio Expand Button

Press the blue button. Speaker announces: 'Forty-seven! That's 4 Tens (40) plus 7 Ones (7)!'

4

Number Challenge Game

Speaker asks: 'Represent seventy-three on the abacus!' Child slides 7 tens and 3 ones → Green light chime!

Why It Works & Notes

Sliding beads on an abacus is the gold standard for tactile place value. Converting physical bead positions into a real-time digital display bridges traditional manipulative math with modern digital readout logic.