Roman Numerals
Values
You can keep the values in your mind as follows.
>V is the upper half of X
>C stands for centum=100, known from centimetre=cm
>L is the lower half of C, if you have some imagination
>M stands for mille=1000, known from millimetre=mm
>D is the right half of (I), an old writing of 1000
>V is the upper half of X
>C stands for centum=100, known from centimetre=cm
>L is the lower half of C, if you have some imagination
>M stands for mille=1000, known from millimetre=mm
>D is the right half of (I), an old writing of 1000
The roman numerals were not fixed until the first century but the exact year that roman numerals were discovered is unknown. Roman Numerals were meant to have originated from tally sticks that were used by the Dalmatian and Italian Shepherds.
Symbols