1900 in Roman Numerals

How to write 1900 in Roman numerals

Roman numerals are built place by place, from the largest value to the smallest. For 1900 the places are 1000 (thousands), 900 (hundreds).

1. Write 1000 as M.
2. Write 900 as CM.

Joined together, M + CM gives MCM.

1900 digit by digit

Check MCM by reading it back

Reading MCM from left to right and adding the pieces: M = 1000, CM = 900. Together that is 1000 + 900 = 1900, so MCM and 1900 match.

Mistakes to avoid with MCM

• Do not write the 4s and 9s additively. 1900 uses subtractive pairs (CM for 900), not strings like IIII or VIIII.
• Only I, X and C may be placed before a larger symbol to subtract, so MCM never contains forms such as VX or LC.
• Read MCM as one number, not letter by letter: add the values left to right, except where a smaller symbol sits before a larger one.

Facts about the number 1900

• 1900 is an even number and composite, with prime factors 2² x 5² x 19.
• In binary 1900 is 11101101100 and in hexadecimal it is 76C.
• Written out, 1900 is "one thousand nine hundred".
• The digits of 1900 add up to 10.
• As a year, 1900 was a common year with 365 days and belongs to the 19th century.

Where you will see 1900 in Roman numerals

Books published at the turn of the twentieth century often show the number 1900 as MCM on their title pages. Publishers preferred Roman numerals for copyright dates because the practice lent an air of established tradition to printed works.

Numbers near 1900

More roman numerals

• 1776 (MDCCLXXVI): previous page
• 1901 (MCMI): next page
• Roman numerals chart: the full list