1900 in Roman numerals is MCM
The Arabic number 1900 is written as MCM in Roman numerals. Below you can see the parts it is built from.
How is {n} written in Roman numerals?
Roman numerals run from the largest value to the smallest: M = 1000, CM = 900. In total MCM = 1900. A smaller symbol before a larger one means subtraction (IV = 4, IX = 9, XL = 40, CM = 900). Roman numerals cover numbers 1-3999.