# Traditional Abacus and Bead Arithmetic/Resources for contributors

## Some simple tools edit

This book makes heavy use of abacus procedure tables like:

Abacus | Comment |
---|---|

ABCDEFGHIJKLM | |

4567890123 | Entering radicand starting in CD (first group) |

2 | First root digit in B |

-4 | Subtract square of B from first group |

2 567890123 | Null remainder |

4 567890123 | Doubling B. Appending next group to remainder |

41 567890123 | 5/4≈1, try 1 as next root digit |

-4 | Continue division by 41, subtract 1✕41 from EF |

-1 | |

41 157890123 | 15 as remainder |

42 157890123 | Double second root digit |

42 157890123 | Append next group |

423157890123 | 157/42≈3, try 3 as next root digit |

-12 | Continue division by 423, subtract 3✕423 from E-H |

-06 | |

-09 | |

423 30990123 | 309 as remainder |

426 30990123 | Double third root digit |

426 30990123 | Append next group |

etc. |

and could also be enhanced by using some abacus diagrams here and there like this one:

A | B | C | D | E | F | G | H | I | K | J | L | M | ||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|

9 | 18 | 9 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 9 | 9 | 9 |

If you plan to contribute to this book, you may find some simple tools located at User:Jccsvq/Abacus diagrams and procedure tables that may make some of these tasks easier for you. (Jccsvq (discuss • contribs) 05:46, 22 August 2021 (UTC))