A positive number below 10; so any of 1, 2, 3, 4, 5, 6, 7, 8 and 9.
I = 1 and X = 10 but IX = 1 less than 10, which is 9.
15 or XVv backward character
M = 1000, XL = 40 (10 less than 50) so MXL represents 1040.
1944 M = 1000 CM = 900 (100 less than 1000) XL = 40 (10 less than 50) IV = 4 (1 less than 5)
The number XIIV is impossible in Roman numerals, as it features two numbers less than V to the direct left of V. The Roman numeral which represents the number 5 - (1 + 1) = 3 less than 10 (X) = 13, is XIII.
Digit
M = 1000, CM (100 less than 1000) = 900, XC (10 less than 100) = 90 and IX (1 less than 10) = 9. So the complete numeral MCMXCIX represents 1999.
I = 1 and X = 10 but IX = 1 less than 10, which is 9.
15 or XVv backward character
M = 1000, XL = 40 (10 less than 50) so MXL represents 1040.
1,000 M 100 less than 1,000 CM 10 X 3 III MCMXIII
1944 M = 1000 CM = 900 (100 less than 1000) XL = 40 (10 less than 50) IV = 4 (1 less than 5)
The number XIIV is impossible in Roman numerals, as it features two numbers less than V to the direct left of V. The Roman numeral which represents the number 5 - (1 + 1) = 3 less than 10 (X) = 13, is XIII.
The digits are the first 10 nonnegative integers (0, 1, 2, 3, 4, 5, 6, 7, 8, & 9) and they are the symbols which make up all numerals. For example, the number 9 is a numeral & a digit, but say 19, which is also a single numeral is at the same time a compilation of two digits in a certain order
2100 + 10 = 2110
8010
CDXLIII 400 is 100 less than 500 = C before D 40 is 10 less than 50 = X before L 3 is 1 + 1 + 1 = III