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Abacus

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Abacus

Welcome to the Abacus Simple English Textbook!

  1. Manual
    1. Appearance
      1. Rows
      2. Columns
      3. Earth beads
      4. Heavan beads
    2. Quick use
      1. Addition
      2. Subtraction
      3. Multiplication
      4. Division
    3. Expert use
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