Abacus: Mystery of the Bead

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Index Page   History - Early counting boards, the Salamis tablet, the framed abacus, abacus today Abacus Techniques - Reading a soroban, clearing a soroban, complementary numbers, simple addition & subtraction, combining finger movements, mechanization Addition - Addition techniques, using complementary numbers, carry overs from right to left, further addition examples Subtraction - Subtraction techniques, using complementary numbers, carry overs from left to right, further subtraction examples Multiplication - The most often used multiplication technique, decimals, predetermine the unit rod, further multiplication examples Division - The most often used division technique, decimals, predetermine the unit rod, further division examples Division Revision - How to quickly and efficiently revise a wrong quotient answer, further revision examples Negative Numbers - Negative answers from subtraction, reading the complementary negative Abacus Care - Caring for your abacus, how to fix warped frames, sticky beads and other problems Abacus Diversions - Good soroban workouts, Crazy Eights, Repeated Sums, Fibonacci numbers References - A list of books and links to websites where more information on abacus can be found Printable options - Print Abacus Mystery of the Bead - a page offering two printable options.

Abacus Photo Gallery   Chinese Suan Pan - Large suan pan, carved symbols on the beam, flags stickers on the frame, found in Thailand. Modern 1:4 bead Soroban - 27 rod soroban, stainless steel reinforcing the back of the beam, circa 1960. Antique 1:5 bead Soroban - 100 year old soroban, with wooden cedar case, signed by owner. Merchant 1:5 bead Soroban - Larger soroban used by shopkeepers and in business. Perkins 1:4 bead Soroban - Modern 27 rod soroban circa 1958, came with a flyer for the Perkins Abacus co. Small 1:5 bead Soroban - An beautiful older wooden soroban that would fit in the palm of your hand Lee Kai-chen Abacus - The famous Abacus made by Lee Kai-chen circa 1958. Russian Schoty - Circa 1970s. Found in the Russian countryside. 24 Karat Gold Abacus - Owner Gary Flom purchased this abacus on Ebay.   Lee's Improved Abacus - Demonstrating the Lee abacus; how it works & what it can do. In depth explanations & illustrations Addition Subtraction Multiplication Division

Advanced Abacus Techniques   Professor Fukutaro Kato Techniques Decimals in Division Decimals in Multiplication Square Roots   Takashi Kojima Techniques Elimination Complementary Square Roots   Professor Fernando Tejón Techniques Multifactorial Multiplication Complementary Numbers Linear Equations   Shane Baggs Techniques Japanese Cube Root Algorithm   Deji Adejbite Techniques Calculating Logarithms   Chinese Suan Pan Techniques Traditional Multiplication Modern Multiplication Short Division Long Division   Abacus Files (pdf files) League for Soroban Education of Japan English Manual Spanish Manual Examination Examples The Abacus, in its Historic and Scientific Aspects Li (1959) Origins of Chinese Abacus

Help Pages Multiplication and Decimals Division Revision Placing Quotient numbers Multiplying Negative numbers Learning Basic Multiplication Digit Sum Quick Check - checking answers The Square Root of 2 to seven decimal places Cooking with Soroban Square Roots - Welton J. Crook Find the GCD and LCM of two numbers Further thoughts on Mechanization Japanese soroban finger techniques Cube Roots - Welton J. Crook Forbes.com ranks abacus #2 Converting Hexadecimal and base 10 Add & Subtract Hexadecimal numbers  Practice Sheets Predetermine the unit rod (an alternative) Make a dust cover for your soroban Fixing a warped Frame Working with Percentages The Leap of Faith   Links - The best of the web   Dave Bernazzani (pdf files) - Dave offers his excellent Soroban/Abacus Handbook here in Adobe Acrobat format Soroban/Abacus Handbook Negative Numbers Extracting Square Roots Use of Decimals for Multiplication and Division   What's New

           
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Totton Heffelfinger  Toronto Ontario  Canada
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