## Some simple tools

This book makes heavy use of abacus procedure tables like:

Caption text
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 (discusscontribs) 05:46, 22 August 2021 (UTC))