1. hit one hundred: abacus addition to practice one of the topics. Its play requirements, is to let the children from 1 to 100, the result is 5050.

2. Three into a: abacus arithmetic practice with one of the topics. In  the abacus dial 123456789, and then from the high to the low, see a few  plus a few (that is, according to the number of the file, plus the  original number of doubles), so for three consecutive, the last plus 9,  the result is 987654321. "Three into a" also known as "three clear", also known as "three back".

3. nine disk clear: abacus plus, subtraction exercises one. Dial 123456789 on the abacus. And then add nine times 123456789. The result is 1234567890. And then nine consecutive minus 123456789, and finally had 123456789. "Nine disk" also called "nine into".

4.  100 son chart: the 1 to 100 of the hundred numbers were filled in 100  square lattice and drawings (see Figure), its each run and each vertical  line on the 10 number of sum are equal to The sum of 505,10 lines is 5050.

5. Phoenix wings: with 16225679 multiplied by 35, draw 567898765. In the abacus, 567898765 this number has the image of the wings.

6. lion roll hydrangea: This is the traditional fun multi-digit multiplication, division exercises. Specific as follows:
5 �� 2 = 10
52 �� 22 = 102
53 �� 23 = 103
...
59 �� 29 = 109
While 59 = 1953125
29 = 512
109 = 1000000000 (ie 1 billion) that is: 1953125 �� 512 = 1000000000
1953125 this number dial on the abacus is like a lion, multiplied by 512, the number of 1000000000. This is a count on the abacus is only a bead by the beam, people vividly called it "Hydrangea".