1,920 in Roman numerals
MCMXX
The number 1,920 is written MCMXX in Roman numerals. As a year it appears in copyright lines and cornerstones written this way.
How MCMXX breaks down
| Symbols | Value |
|---|---|
M | 1,000 |
CM | 900 |
XX | 2 × 10 = 20 |
MCMXX | 1,920 |
This numeral uses the subtractive rule: a smaller symbol placed before a larger one is subtracted from it. Only six such pairs are legal — IV (4), IX (9), XL (40), XC (90), CD (400) and CM (900).
Nearby numbers
| Number | Roman numeral |
|---|---|
| 1,915 | MCMXV |
| 1,916 | MCMXVI |
| 1,917 | MCMXVII |
| 1,918 | MCMXVIII |
| 1,919 | MCMXIX |
| 1,920 | MCMXX |
| 1,921 | MCMXXI |
| 1,922 | MCMXXII |
| 1,923 | MCMXXIII |
| 1,924 | MCMXXIV |
| 1,925 | MCMXXV |
The seven symbols
I | 1 | C | 100 |
V | 5 | D | 500 |
X | 10 | M | 1,000 |
L | 50 |
1,920 in other notations
| Roman | MCMXX |
| Binary | 11110000000 |
| Hexadecimal | 780 |
| Octal | 3600 |
| Written out | one thousand nine hundred and twenty |
Writing it by hand
Work down through the symbol values, taking as many of each as will fit before moving to the next. For 1,920:
M = 1000 remaining: 920
CM = 900 remaining: 20
2 × X = 20 remaining: 0The result reads MCMXX — 5 characters, against 4 digits in Arabic numerals.
Frequently asked questions
What is 1,920 in Roman numerals?
MCMXX
How do you read MCMXX?
Work left to right, adding each symbol — except where a smaller symbol precedes a larger one, in which case it is subtracted. M is 1,000, CM is 900, XX is 20, giving 1,920 in total.
How do you write 1,920 in words?
one thousand nine hundred and twenty.
Why is there no zero?
Roman numerals have no symbol for zero. The concept reached Europe only with Hindu-Arabic numerals, centuries after the system was in use — which is a large part of why it was eventually replaced for arithmetic.