From: http://hi.baidu.com/%C8%F1o%5Fo%C8%F1/blog/item/aee416b1687a3251092302cf.html
Arabic numerals: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 100, 1000, 10000
Chinese: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
Uppercase letters: 1, 2, 3, 4, 5, 5, 10, Yuan), angle, minute, zero, and integer
Yi, er, San, Si, Wu, Lu, XI, XI, pick, XI, Lu, Min, Min, Yuan (yuan), angle, minute, zero, and integer.
Arabic numerals (1, 2, 3 ......), Or lowercase Chinese characters (numbers 1, 2, 3 ......), Because the strokes are simple and easy to be altered, Chinese characters must be capitalized for the numbers in the general documents and commercial financial bills: one, two, three, Si, Wu, Lu, Chu, pick, Lu, Zhi, Lu, Lu (the strokes of ", MB" are already complicated, there are few opportunities for use, and there is no need to replace it with other words ). For example, "3564 yuan" is written as "Yuan ". These Chinese characters are generated very early and used as uppercase numbers. This traditional way of writing numbers has been fully used since the Tang Dynasty, and gradually standardized into a set of "Capital digital ".
(Excerpted from the dictionary of Practical Chinese standards, Chinese Publishing House, 1st)