Abacus is called abacus, and abacus has corresponding rules for four operations, which are collectively called abacus rules. With the use of abacus, people have summed up many formulas to make the calculation faster. Compared with general operation, skilled abacus calculation is not inferior to calculator, especially addition and subtraction.
Carve the board into three parts, the upper and lower parts are used to block the beads, and the middle part is used to locate them. Each person has five beads, and the upper bead and the lower four beads are distinguished by color, which is later called "file". There are five beads on the top and one on the bottom.
Add five, add ten, break five, add ten, and add one: one goes up and down, five goes to four, one goes to nine and one enters. Plus two: two up two down five to three, two to eighty-one, plus three: three up three, three down five to two, three to seventy-one, plus four: four up four, four down five to one, four to sixty-one, plus five: five up five, five to fifty-one.
Plus six: six goes up six, six goes up four into one, six goes up five into one, plus seven: seven goes up seven, seven goes up three into one, seven goes up two into five into one, plus eight goes up eight, eight goes up two into one, eight goes up three into five into one, plus nine: nine goes up nine, nine goes up one into one, nine goes up four and five into one.
Expand the development process of data abacus
The ancient bead algorithm is to calculate beads by hand. In ancient times, abacus only used these ten codes to develop various algorithms and compiled a formula, which is easy to master. In the Ming dynasty. The central idea of canonical bead algorithm in Ming Dynasty is to improve the degree of mechanization and realize the goal of mindless automation.
The direct result of perfecting the abacus mechanization algorithm in the Ming Dynasty was to make mathematics unprecedentedly popular among the public. Use the abacus calculation mechanization algorithm, recite songs, practice pearl picking, and master the abacus calculation algorithm even if you don't understand the principle. Regardless of public schools, private schools, tutors, merchants and shopkeepers, bead algorithm can be taught, and even children can learn to master it.
This bead algorithm continued until 1950s, and even today in some places. It is also for this reason that abacus spread quickly and even spread overseas. In his scientific discovery, invention and creation, he completed a lot of calculations with abacus, thus discovering the "law of twelve averages", which is the top discovery in the world.
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