ABACUS: MYSTERY OF THE BEAD
The Bead Unbaffled - An Abacus Manual
Advanced Abacus Techniques - What's new
Page Updates
2022
▪ Spanish translations
links to many of our abacus tutorials - Tranlators Jesus Cabrera and Carlos
Luna
(August, 16)
▪
New index page for the Advanced Abacus pages - -
Jesus Cabrera
(August, 16)
▪
Abacus: el
Misterio de la Cuenta (PDF) - Carlos Luna did a
wonderful job with this Spanish translation (August,
10)
▪ Ábaco_Oriental
Guía a la Aritmética con Cuentas -Wikilibro - Jesus
Cabrera.
(Wednesday,
July 6 )
▪
THE EASTERN ABACUS
- A Guide to Bead Arithmetic - 360 page pdf
file by Jesus Cabrera.
(Sunday,
July 3 )
▪
Using an abacus
(Wikibooks) - author Jesus Cabrera.
(Sunday,
July3 )
▪
Traditional Abacus and Bead Arithmetic
(Wikibooks) - author Jesus Cabrera.
(Sunday,
July 3 )
▪ Easy Division - Carlos Luna translation (Saturday,
June 11)
▪ 316x29 in
Spanish - Carlos Luna translation (Saturday,
April 30)
2021
▪
jccAbacus -
new abacus website created by Jesús Cabrera. (Sunday,
May 16)
2020
▪
A Short Guide to the 5th Lower Bead -
a Jesus Cabrera technique. (Monday,
December 21)
▪
Specially
Crafted Division Tables - a masaakimurakami
technique. (Thursday, February 6)
▪
Easy Division
- a Steve Treadwell
technique. (Tuesday, January 28)
▪
Google Drive off site link
Multiply 316 x 29 - a Milton Zuluaga technique. (Wednesday,
January 15)
2019
▪
Find an approximation of Pi
(π)
using the formula (2143/22)^(1/4) ~=Pi
-
a Dom Delage technique (Tuesday,
December 3)
▪
The Other Side of Soroban - a masaakimurakami
technique. (Thursday,
November 28)
▪
Division by Complementary Numbers - a masaakimurakami
technique. (Monday, October 28)
▪
Two techniques where
the divisor begins with One - a masaakimurakami
technique. (Monday, October
28)
▪
6 techniques
for multiplication - a masaakimurakami
technique. (Thursday, October 3)
▪
Multiplication with Excessive multiplicand - a masaakimurakami
technique. (Thursday,
October 3)
▪ Regressing
Multiplier to the power of 10 - a masaakimurakami
technique. (Thursday, September 12)
▪
Division
with Excessive Quotient - a masaakimurakami
technique. (Monday, September 9)
▪
Multiply
and Divide Feet and Inches - a Dino Marcantonio
technique. (Monday, March 10)
2017
▪
Foot-Inch Calculator
- a Dino Marcantonio technique.
(Tuesday, March 21)
▪
Google Drive off site link
Division and Back Again (Monday, March 13)
2016
▪
Added new section "Revising Answers" to
The Chinese Rule Advantage (Tuesday,
October 18)
▪
Added
Chinese
Division Table (pdf file) to
Short Division Techniques (Wednesday,
July 20)
2015
▪
Adding Hexadecimal numbers using the Binary number system (Monday,
November 23)
▪
Improvements to the Kato Square Root Method - a Steve Treadwell
technique. (Monday, May 4)
▪
Division by Complementary
Numbers (DCN) - a Fabrice Bouillerot technique
(Saturday February 28)
▪ Calculating Feet and Inches
- using base 12 and an inverted suan pan
(Tuesday February 17)
2014
▪
Decimal Hexadecimal Conversion - a Steve Treadwell
technique. (Tuesday, December 16)
▪ Convert Hex to Decimal by
Dividing by Hex A (Saturday, December 6)
▪
Octal Hexadecimal Conversion - a Steve Treadwell
technique. (Monday,
December 1)
▪
Multiplying Hexadecimal
Numbers
using an Octal Table
(Saturday, November 22)
▪
Convert
Octal to Hexadecimal using an
Octal
Division Table - a Hannu Hinkka Technique. (Wednesday,
November 5)
▪
Using
Hexadecimal Tables - Long Division &
Conversion
- a Hannu Hinkka Technique. (Monday,
November 3)
▪
Hexadecimal Arithmetic Octal Code - a Steve Treadwell
technique. (Saturday, November 1)
▪
Multiplying Hexadecimal
Numbers -
a 36 kb pdf file (Saturday,
October 25)
▪
Octal Arithmetic on the Soroban - a Steve Treadwell
technique. (Wednesday,
January 29)
2013
▪ Binary Method for Calculating GCD
- a Hannu Hinkka Technique. (Saturday,
November 15)
▪ Chinese Division Rules on a Soroban
(Wednesday,
October 23)
▪
Shifting the unit
rod - added to
ABACUS: MYSTERY OF THE BEAD
(Tuesday, September 10)
▪
Off site link
Early Calculation (5.61 mb pdf file).
(Saturday,
July 6)
▪
Decimal and Octal
Conversion Techniques
- Marcos Labriola.
(Saturday,
June 1)
▪
25
anzan addition subtract exercises with answers (
340 kb .zip file) (Thursday, April 25)
▪ Conversion from Decimal to Binary
-
a Marcos Labriola technique. (Monday,
March 4)
▪ Added
The Chinese Rule Advantage
to Short Division
Techniques (Tuesday, February 5)
▪ Cleaned up
Chinese
Short Division Techniques to make it an easier read.
(Sunday, February 3)
▪ Added Suan Pan and the Decimal -
Division (Sunday, February 3)
▪ Added Suan Pan and the Decimal -
Multiplication (Sunday, February 3)
▪ Extensive edit to my page
Traditional Multiplication - Suan Pan (Sunday, February 3)
▪ Extensive edit to my page
Long Dvision Techniques - Chinese Suan Pan
(Thursday, January
28)
▪ Extensive edit to my page
Digit Sum Quick
Check (Thursday, January 3)
2012
▪ New
examples added to Long Division Techniques - Chinese
Suan Pan. (Sunday, December 16)
▪
Master Craftsman - YouTube videos showing a master
soroban maker at work. (Tuesday, March 12)
▪
Anzan Multiplication -
one method that some experts like to use. (Sunday,
January 29)
2011
▪ The
Five Earth Bead Advantage - a Hannu Hinkka technique.
(Monday,
December 12)
▪
New photo - Ray McCulloch's small 23 rod abacus.
(Tuesday, November 29)
▪
The Nine Bead Abacus,
it's Theory and Derivation - Joe VanCleave
(Saturday, November 26)
▪
Abacus Tax Calculation Procedure - a Joe VanCleave
technique. (Saturday, November 26)
▪ Added to
Perkins
photos a
detail of the abacus. (Sunday, October 16)
▪
Multiplication and Division in binary
- a Steve Treadwell technique. (Saturday,
September 24)
▪
Decimal/Binary Conversion on the Soroban
- a Steve Treadwell technique. (Wednesday,
September 21)
▪ Another
Division Revision Example
- 278502 ÷ 399 = 698, linked from
Division
Revision (Sunday,
September 4)
▪
Balanced ternary arithmetic on the abacus
- a Steve Treadwell technique. (Tuesday,
June 21)
▪
Russian Peasant Multiplication
- a tutorial contributed by Hannu Hinkka. (Monday,
May 30)
▪
Quick Glance Table - added to
Predetermining the
Unit Rod (Sunday, March 27)
▪
Brain Scan study.pdf - abacus experts versus
non-expert groups. (Thursday, March 24))
▪ Tutorial
- Negative numbers. How to subtract 95 from zero (0 -
95 = - 95). (Wednesday, March 9)
2010
▪
Anzan pdf
files- added to the
Abacus
Files. (Wednesday,
June 2)
▪
An
easy-to-make abacus - offsite link added to the
Learning resources section.
(Tuesday,
May 18)
▪
The Cranmer
abacus - added to the
photo gallery.
(Monday,
May 17)
▪ solsTiCe d'Hiver's exercise generator -
offsite link added to the
Learning resources section. (Friday,
March 26)
▪
Ray
McCulloch soroban - added to the
photo gallery. (Friday,
February 5)
▪ The Leap of
Faith (Sunday, January 24)
▪ Abacus
Algebra - Gary Flom shows us techniques for doing
algebra on a soroban.
(Friday, January 15)
2009
▪
Working with Percentages - techniques for finding and
adding percentages.
(Wednesday, August 19)
▪ Fixing a
Warped Frame - older soroban can develop a problem
with warping.
(Saturday, July 25)
▪
Modified Welton J Crook - Steve Treadwell's
faster version of Crooks CubeRt algorithm.
(Thursday, April 2)
▪
Modified Welton J Crook - Steve Treadwell's faster version of Crooks SqRt algorithm.
(Sunday, March 22)
2008
▪ Euclidean
norm of a vector - Gary Flom.
(Sunday, November 2)
▪
Linear
Equations
a Fernando Tejón technique.
(Wednesday, September 24)
▪ Off site link
Association Française de Soroban et autres Abaques
(Friday, August 1)
▪
Stchoty Le Magasin Pittoresque French language article
on the subject of Schoty. Early 19th century.
(Wednesday, July 9))
▪
Off site link abacus related words in English.
(Monday, May 12))
▪ Make a Dust Cover for your Soroban
(Saturday, March 22)
▪ Predetermine
a Unit Rod an alternative method.
(Wednesday, February 13)
▪
Calculating
Logarithms on a Soroban a Deji Adegbite technique.
(Wednesday, February 6)
2007
▪
Practice
Sheets addition, subtraction, multiplication
& division (Tuesday December 18)
▪
Add & Subtract
Hexadecimal Numbers (Wednesday November 28)
▪
Convert between Base 10
and
Hexadecimal (Sunday, November 25)
▪
Knott's 1885 article "The Abacus in its Historic and Scientific
aspects." re-typed by Nanami Kamimura.
(Thursday, November 1)
▪
Patterns in Kojima's technique for multiplication.
Added to
Multiplication (Saturday, September 29)
▪
Magic Trick
that uses
DigitSum techniques. (Thursday,
September 6,)
▪
Japanese Cube Root Algorithm
a Shane Baggs technique. (Thursday, July 12)
▪ Ekimai.com
abacus techniques with a link to purchasing soroban in
the U.K. (Wednesday, July 11)
▪ Print Lee's Abacus
(1.98 mb PDF File) print the Lee's Abacus demonstration.
(Monday, June 25)
▪ Print Abacus: Mystery of the Bead
the page offers two options for printing the manual.
(Saturday, June 17)
▪ Checking a Square Root Answer
(Monday, April 23)
▪ Off site link Better@Math~Better@Thinking (Soroban, New York City).
(Friday, March 16)
▪ Off site link
the
Abacus on Wikipedia.
(Saturday, March 10)
▪ Off site link
build practice sheets (addition, subtraction, multiplication, division).
(Friday, January 26)
2006
▪ Off site link Soroban Cymru - Soroban in the the U.K.
(Friday, December 22)
▪
Li (1959) Origins of Chinese Abacus
(735 kb PDF File)
1959 Article by Shu-T'ien Li.
(Friday, December 22)
▪ The Abacus, in its Historic and
Scientific Aspects
(1.97 mb PDF File) 1885 Article by C. G. Knott.
(Wednesday,
December 20)
▪
Site Map added to all my pages.
(Thursday November
30)
▪
Forbes.com ranks the abacus 2nd most important tool in history.
(Tuesday, November 21)
▪ League for Soroban Education
in Spanish
(447 kb PDF File) (Monday,
September 18)
▪ Dave
Bernazzani's Soroban/Abacus Handbook
(280kb PDF File) (Wednesday,
September 13)
▪ Celsius &
Fahrenheit working with negative values. Added to
Negative numbers.
(Tuesday, July 25)
▪
Cube Roots by Welton J. Crook from his book 'Abacus
Arithmetic'. (Tuesday, July 11)
▪
Kojima Square
Roots Takashi Kojima's method for extracting square
roots. (Sunday, June 11)
▪
Simple addition & subtraction
a new section added to
Abacus: Mystery of the Bead.
(Friday, May 26)
▪ Finger techniques added to
Abacus: Mystery of the Bead.
(Thursday, May 25)
▪ Further
thoughts on Mechanization added to
Abacus: Mystery of the Bead.
(Tuesday, May 23)
▪
explanation of kanji characters making up the word soroban.
(Wednesday, May 3)
▪ Find the GCD and
the LCM of two numbers using abacus techniques.
(Tuesday, May 2)
▪
Square Roots by Welton J. Crook from his book 'Abacus Arithmetic'.
(Tuesday, April 18)
▪ Cooking with Soroban abacus
techniques for your kitchen. º¿º (Friday, March 31)
▪ Off
site link Stephen Utti's multiplication practice sheets.
(Sunday, February 26)
▪ Off site link Chisenbop (finger math) tutorial.
(Saturday, January 15)
2005
▪ Square
root of 2
solved to seven decimal places. (Saturday, December 3)
▪
Digit Sum Quick Check
a quick way to check the accuracy of an answer. (Monday,
November 28)
▪
Examination examples
(85 kb PDF File) updated from Kojima's book.
(Tuesday, July 12)
▪
Complementary numbers
a Fernando Tejón technique.
(Sunday, July 10)
▪
Multifactorial multiplication
a Fernando Tejón technique.
(Thursday, June 27)
▪
Off site link Erik Peterson's java applet for
leaning Chinese suan pan.
(Friday, April 29)
▪
Modern Chinese technique
for multiplication. (Friday, April 1)
▪ Lee's
Improved Abacus new page demonstrating how Lee's Abacus works.
(Friday, March 25)
▪ Abacus: Mystery of the Bead
an abacus manual. (Friday, March 11)
▪
Off site link Fernando Tejón's Spanish language soroban pages.
(Monday, February 7)
▪
Off site link Torsten Reincke's number dictation program.
(Monday, February 7)
▪
Basic
multiplication
ideas for teaching multiplication using a soroban. (Thursday,
January 27)
▪
Soroban manual
(2.84 mb PDF File) from the League for Soroban Education of Japan.
(Saturday, January 22)
2004
▪ Off site link
Stephen Utti's soroban add/subtract practice sheets. (Tuesday, Nov
30)
▪
Negative numbers
how to multiply them. (Friday, November 5)
▪
Quotient answers where answers go on the soroban. (Saturday, September 25)
▪
Traditional Chinese
technique for multiplication. (Friday, July
23)
▪
Division Revision help page. (Wednesday, July 21)
▪
Multiplication and Decimals help page. (Tuesday, July 20)
▪
Kato Square Roots
Professor Fukutaro Kato method for extracting square roots. (Tuesday,
July 20)
▪ Long
division techniques for Chinese suan pan. (Sunday Jul 4)
▪
Short division techniques for Chinese suan pan. (Tuesday,
June 15)
▪
Takashi Kojima's multiplication
by complementary numbers. (Wednesday, May 26)
▪
Takashi
Kojima's elimination of the Initial digit of a
multiplier beginning with one. (Thursday, May 6)
▪
Division &
Multiplication Professor Fukutaro Kato method for pre-determining the unit rod. (Tuesday, March
16)