“Two -one added five”, “Three times and five divisions and two”, do you remember the beading formula?

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“二一添作五”“三下五除二”,你还记得珠算口诀吗?

The smallest abacus in the world (silver 10mm*5mm).(Guohua Pearl Museum) Photography Jin Yaowen/People’s Pictorial

“二一添作五”“三下五除二”,你还记得珠算口诀吗?

Blind abacus.(Chen Baoding Collection) Photography Li Changjie/People’s Pictorial

On December 4, 2013, the abacus became the 30th project in China to be selected as the UN’s intangible cultural heritage list, and was hailed as the “fifth largest invention” in China. At this moment, we will appreciate the invention of these millennium mathematics wisdom that condenses the Chinese nation. This is the three -pearl abacus on the rectangular beam in the Qing Dynasty. (Tunxi Pearl Museum) Photography Du Zequan/People’s Pictorial (Photos Source: People’s Pictorial China Special Gallery)

“二一添作五”“三下五除二”,你还记得珠算口诀吗?

Beads, this ancient and magical tool accompanied us for thousands of years. Whether it is daily calculations, scientific research, or even computer popularization, the figure is indispensable. This is a computing plate in the Qing Dynasty, like a large wheel. (Tunxi Pearl Museum) Photography Du Zequan/People’s Pictorial

“二一添作五”“三下五除二”,你还记得珠算口诀吗?

As early as the “algorithm Tongzong” of the Ming Dynasty, the algorithm of the addition, subtraction and multiplication, and the algorithm of the square and open cubic cubic cube was recorded. This is the first generation of ancient abacus based on the literature. White beads represent “1”, and black beads represent “5”. (Calculating collector Chen Baoding Collection) Photography Li Changjie/People’s Pictorial

The world’s largest abacus (wood 625cm*168cm, weighs 1008kg). (Guohua Pearl Museum) Photography Jin Yaowen/People’s Pictorial

“二一添作五”“三下五除二”,你还记得珠算口诀吗?

The historic modern needle -line marching abacus, just roll the cloth together with the beads when walking, is easy to carry. (Tunxi Pearl Museum) Photography Du Zequan/People’s Pictorial

“二一添作五”“三下五除二”,你还记得珠算口诀吗?

The Qing Dynasty silver lock abacus, which is full of local folk customs in Huizhou, its exquisite patterns were used as emblem shapes by the history of Japanese abacus history. (Tunxi Pearl Museum) Photography Du Zequan/People’s Pictorial

“二一添作五”“三下五除二”,你还记得珠算口诀吗?

The Qing Dynasty water cigarette tube abacus. (Tunxi Pearl Museum) Photography Du Zequan/People’s Pictorial

“二一添作五”“三下五除二”,你还记得珠算口诀吗?

Silver rings 指, seven pearls and seven gear (12mm*7mm), the abacus beads above are smaller than rapeseed. This rings fidelity shows that the production technology at that time was quite fine. (Chen Baoding Collection) Photography Li Changjie/People’s Pictorial

The ivory abacus of the Ming Dynasty, the seven pearls and eleventh gear, the beautiful flower pattern is engraved behind it. (Chen Baoding Collection) The information map of this magazine

“二一添作五”“三下五除二”,你还记得珠算口诀吗?

All kinds of micro -abacus. (Chen Baoding Collection) Photography Li Changjie/People’s Pictorial

“二一添作五”“三下五除二”,你还记得珠算口诀吗?

A total of 7 people can use 4 meters, 7 beads 200 strokes, and 1,400 beads at the same time. (Original existing Tianjin Museum) Photography Li Changjie/People’s Pictorial

“二一添作五”“三下五除二”,你还记得珠算口诀吗?

American golden sleeve abacus. (Chen Baoding Collection) Photography Li Changjie/People’s Pictorial

“二一添作五”“三下五除二”,你还记得珠算口诀吗?

In recent years, the unique operational skills of pearls have become an important way to promote children’s intellectual development in Japan, India, and the United States. This is a Japanese abacus taken in 1986. It is a computing tool for computers and abacus. (Chen Baoding Collection) Photography Li Changjie/People’s Pictorial