60= circle (circle)
70= inch (j √ n)
80= wither (k)
90= "Hu"
200= 0 (b √)
Under normal circumstances, those born after 40 are not often used in life. Twenty or thirty is still commonly used, such as: twenty-four solar terms, twenty-four flavors (Guangdong herbal tea), "May 30 massacre" and so on. Besides, people in their twenties and thirties use calendars and calligraphy more.
Extended data:
Twenty, thirty, thirty, forty and so on. They are all lowercase numbers.
Lowercase numbers exist relative to uppercase numbers, which generally appear in informal texts. The disadvantage is that it is easy to modify and falsify (for example, a number of 10 thousand can become 30 thousand with a few strokes), and the capitalization is relatively complicated, so it is difficult to falsify.
The numbers on general documents and commercial financial bills should be capitalized in Chinese characters: one, two, three, four, five, six, seven, eight, nine, ten, one hundred, and one thousand (the strokes of "ten thousand, one hundred million" are complicated and seldom used, so there is no need to use other words instead). For example, "3,564 yuan" is written as "3,000 Wu Bai and 64 yuan". The complicated writing of this number was fully used as early as the Tang Dynasty, and then it was gradually standardized as a set of "uppercase numbers".
Baidu Encyclopedia-chinese numerals