The universal abacus has one bead on the top and four beads on the bottom. The bottom bead represents 1 and the top bead represents 5. If 1, dial up a bead from the bottom, and if 2, dial another bead. At 4, dial four beads. When it reaches five, dial down the top beads and the bottom four.
Generally from the ninth to the fifteenth gear, there is a beam in the middle, two beads on the beam, each bead counts as five, five beads below the beam, each bead counts as one, and the beads are moved after positioning during operation. Calculations include addition, subtraction, multiplication and division.
Extended information:
Abacus formula:
1. Addition formula: add without carry, add with carry, directly add to five, add to ten, add to break five Add ten,
Add one: one up, one down, five down, four, one down, nine, one;
Add two: two up, two down, five down, three down, two Go to eight and go to one;
Add three: three on three, three on five go to two, go on three to seven and go to one;
Add four: four on four, four on five go to one , four goes to six and goes to one;
Add five: five goes to five, five goes to five and goes to one;
Add six: six goes to six, six goes to four and goes to one, six goes to one Go to five and add one;
Add seven: seven to seven, seven to three and go to one, seven to two and five to one;
Add eight: eight to eight, eight to two Add one, go up to eight, go to five, go into one;
Add nine: go up nine, go up to nine, go to one, go into one, go up nine, go up to four, go to five, go into one;
2. Subtraction formula : The subtraction of the subtracting position does not abdicate, the subtraction of the subtracting position decreases by ten and supplements the five.
Subtract one: go down one, go up four and go to five, go back one and return nine;
Subtract two: go down two and go two, go up and go three and go to five, go back one and go back eight. ;
Subtract three: three goes down to three, three goes up and two goes to five, three goes back and one goes back to seven;
Subtract four: four goes down to four, four goes up and one goes to five, four goes back to one Return six;
Subtract five: five is reduced to five, five is returned to one and five is returned;
Reduction to six: six is ??reduced to six, six is ??returned to one and four is returned, six is ??returned to one and five is returned to one ;
Subtract seven: seven is reduced to seven, seven is reduced to one and three is returned, seven is reduced to one and five is returned to two;
Subtract eight: eight is reduced to eight, eight is reduced to one and returned to two, eight Return one to return five and return three;
Subtract nine: nine is to return nine, nine is to return one to one, nine is to return one to five and return to four;
Baidu Encyclopedia - Abacus