Content of jccAbacus Web

 Summary of what was published up to May 2021

The following list corresponds to the content of jccAbacus Web as of today. From now on, the current status of the Web will appear on an accessory page on this blog.  

Articles:

• Traditional abacus techniques section

• Traditional division section

• Modern and traditional division; close relatives

• Guide to traditional division (帰除法)

• Dealing with overflow

• Specialized division tables

• Traditional division examples

• One digit divisor exercises (short division)

• 123456789/9 on a 2:5  (Printable PDF)

• 123456789/8 on a 2:5  (Printable PDF)

• 123456789/7 on a 2:5  (Printable PDF)

• 123456789/6 on a 2:5  (Printable PDF)

• 123456789/5 on a 2:5  (Printable PDF)

• 123456789/4 on a 2:5  (Printable PDF)

• 123456789/3 on a 2:5  (Printable PDF)

• 123456789/2 on a 2:5  (Printable PDF)

• Multi digit divisor exercises (long division)

• 998001/999 using the suspended bead (Kenshu, xuán zhū 懸珠)  (Printable PDF)

• 998001/999 on an 1:5 abacus  (Printable PDF)

• 998001/999 on a 3:5 abacus  (Printable PDF)

• 412/896 in detail on a  2:5 abacus  (Printable PDF)

• 888122/898 on a 2:5 abacus  (Printable PDF)

• 888122/989 on a 2:5 abacus  (Printable PDF)

• The 5th lower bead

• Square root; the traditional way

• Using a fourth finger on the suanpan

• Division by powers of two

• Finger movement order

• Advanced abacus algorithms section

• Newton's method for abacus: square, cubic and fifth roots

• The radix method for logarithms

• Tide abacus

• Julian day

• Abbreviated operations

• The twelfth root of 2

Slideshows

• Using the 5th lower bead 1-Addition

• Using the 5th lower bead 2-Subtraction

• Traditional division 998001÷999 on a 2:5 abacus

• Traditional division 998001÷999 on a 1:5 abacus