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What is the length of this math textbook?
The math textbook is about 2 1 cm long.

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Mathematics is a subject in primary and secondary schools. China was called arithmetic in ancient times, and later it was called arithmetic. Mathematics was unified from September 65438 to September 0936. The contents of mathematics teaching in primary and secondary schools mainly include arithmetic, algebra, geometry, trigonometry, plane analytic geometry, calculus, statistics and probability.

In order to meet the requirements of economic and social development in different periods and the changes of educational purposes and educational objects, it was changed. The establishment of mathematics in China School began in the sixth year of Tongzhi in Qing Dynasty (1867), when the Arithmetic Museum was added in Shi Jing Wentong Museum.

In November of the 29th year of Guangxu (1904 65438+ 10), it was stipulated that elementary schools and higher schools set up arithmetic, while middle schools and higher schools (equivalent to high schools) set up arithmetic, algebra, geometry, trigonometry, analytic geometry and calculus.

1922, the Ministry of Education of the National Government issued an order to reform the educational system. The following year, it was stipulated that elementary schools should offer arithmetic, algebra, geometry, trigonometry and analytic geometry. This subject setting method has been used until the founding of the people's Republic of China.

Only a few subjects have increased or decreased in different periods. For example, calculus was added in some schools before 1949, analytic geometry was not offered in middle schools after 196 1 year, and arithmetic was not offered in middle schools after1961year. Plane geometry is completely decentralized to junior high school, and plane analytic geometry and probability are added to senior high school. Since 1978, primary school mathematics has been changed.

1978- 1980 middle school has set up basic knowledge such as calculus, probability and statistics, logical algebra, etc., and appropriately infiltrated the ideas corresponding to sets into textbooks. 198 1 year later, the knowledge of calculus changed to some schools.

Since 1950s, with the development of modern science and technology, especially the appearance and development of electronic computers, mathematics has penetrated into almost all scientific departments, playing an important role not only in the application and development of natural science, but also in the application and development of social science.

In order to meet this need, many countries have reformed the teaching content of mathematics in primary and secondary schools and added some modern mathematics content. Mathematics classes in China middle schools include algebra, geometry, analytic geometry, calculus and so on.