Three: Arabic numeral "3"

XI: Arabic numeral "1 1"

: Arabic numeral "12"

Counting method

1, the same number is written continuously, and the number represented is equal to the number obtained by adding these numbers, for example: Ⅲ = 3;

2. The small number is on the right side of the big number, indicating that the number is equal to the number obtained by adding these numbers, such as VIII = 8；; Ⅻ = 12;

3. Small numbers (limited to I, X, C) are on the left of large numbers, and the numbers represented are equal to those obtained by reducing the number of large numbers, such as Ⅳ = 4; Ⅸ= 9;

4. During normal use, the serial number shall not be repeated more than three times. (Except "IIII" at four o'clock on the dial)

5. Draw a horizontal line above a number, indicating that the number is enlarged by 1000 times.