The Roman numerals from 1 to 20 are... I (1), II (2), III (3), IV (4), V (5), VI (6), VII (7), VIII (8), IX (9), X (10), XI (11), XII (12), XIII (13), XIV (14), XV (15), XVI (16), XVII (17), XVIII (18), XIX (19), XX (20).
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The correct way to write 1209 in Roman Numerals is MCCIX.
Due to rules made during the Middle Ages, today we write out 19 in Roman numerals as XIX. But the Romans themselves would have probably wrote out 19 as XVIIII and then simplified it to IXX. In fact the Latin word for 19 is "undeviginti" which literally means one from twenty. Hence: IXX*IXX = -I*IXX + XX*IXX = +I-XX-XX+CCCC = CCCLXI (361) In Hindu-Arabic numerals: -1(-1+20) + 20(-1+20) = +1-20-20+400 = 361
In todays notation of Roman numerals: VIII-I-MCMXLVII
1.5 = IS in Roman numerals because 1= I and 0.5 = S
I/i/mmxi