The numerical units of China are: 1, 10, 100, 1 0,000, 1 billion, trillion, Beijing, Yi, Yi, Gou, Jian, Zheng, Zai, Ji. Decimal system is below 10,000, and decimal system is after 10,000, that is, 10 million is 100 million, trillion is 1 trillion, and 10,000 Beijing is a shame. During the Tang Dynasty, a new member was added: Dashu. Part of it was borrowed from Sanskrit in ancient India, which originally corresponded to decimal, and later expanded to new numbers. There are many mathematical units, such as:

Length unit: millimeter, centimeter, decimeter, meter, kilometer. Area unit: square millimeter, square centimeter, square decimeter, square meter, hectare and square kilometer. Unit of volume: cubic millimeter, cubic centimeter (milliliter), cubic decimeter (liter), cubic meter. Time unit: seconds, minutes and hours. Weight unit (mass unit): grams, kilograms, kilograms, tons. The traditional units of length in China are Li, Zhang, Chi, Inch, Xun, Jie, Fu, Zhi, Yi, Bu, Chang, Ya, Yan, Ji, Rail, Luo, Millimeter, Li and Min. The basic conversion relationship is as follows: 1 foot = 10 foot; 1 ft = 10 inch; 1 inch = 10 points; 1 = 10%. 1 Zhang ≈ 3.33m; 1 ft ≈3.33 decimeter; 1 inch ≈3.33 cm. 1km = 1000m； 1 meter (m) = 100 cm; 1 cm = 1 0mm.1Li = 150 sheets = 500m; 2 Li = 1 km (1000 m).