Roman numerals....
1 = I
2 = II
3 = III
4 = IV (or IIII on old clocks, watches and sundials)
5 = V
6 = VI
7 = VII
8 = VIII
9 = IX
10 = X
20 = XX
30 = XXX
40 = XL
50 = L
60 = LX
70 = LXX
80 = LXXX
90 = XC
100 = C
500 = D
1000 = M
2000 = MM
3000 = MMM
The numbers 11 - 19 and 21 - 29 etc follow the same pattern as the numbers 1 to 9 but preceeded by X or XX etc. The same applies to numbers preceeded by 100s or 1000s. Some examples...
14 = XIV
44 = XLIV
88 = LXXXVIII
151 = CLI
423 = CDXXIII
666 = DCLXVI
1066 = MLXVI
2009 = MMIX
12629 is already in Hindu-Arabic numerals
The Roman numerals LXVII=67 in Hindu Arabic numerals.
The Roman numerals of XX are the equivalent of 20 in Hindu-Arabic numerals
The Roman numerals of CCX are the equivalent of 210 in Hindu-Arabic numerals.
The Roman numerals of DCCC are the equivalent of 800 in Hindu-Arabic numerals
Hindu Arabic numerals are the ones we use. 39 is already in Hindu-Arabic numerals.
12629 is already in Hindu-Arabic numerals
The Roman numerals LXVII=67 in Hindu Arabic numerals.
The Roman numerals of XX are the equivalent of 20 in Hindu-Arabic numerals
The Roman numerals of CCX are the equivalent of 210 in Hindu-Arabic numerals.
The Roman numerals of DCCC are the equivalent of 800 in Hindu-Arabic numerals
In Hindu-Arabic numerals, DCLXII would be 662.
437 is already in Hindu-Arabic numerals
The Roman numerals of XXVIII are the equivalent of 28 in Hindu-Arabic numerals
dcccxiii in Roman numerals is equivalent to 813 in Hindu-Arabic numerals.
12629 is already expressed in Hindu-Arabic numerals
12629 is already written in Hindu-Arabic numerals.