70 in Roman numerals at a glance
- Roman numeral
- LXX
- Lowercase
- lxx
- Letters
- 3
- Parts
- L · X · X
- Subtractive pairs
- None
- In words
- seventy
- Latin name
- septuaginta
How LXX is built
Roman numerals are written one decimal place at a time, from the largest place to the smallest. Converting each digit of 70 separately and joining the pieces gives LXX:
| Place | Digit | Value | Numeral |
|---|---|---|---|
| Tens | 7 | 70 | LXX |
| Ones | 0 | 0 | — (zero has no symbol) |
Reading it back, left to right:
- L = 50 → running total 50
- X = 10 → running total 60
- X = 10 → running total 70
The rules LXX follows
- Largest to smallest. LXX uses the symbols L and X (3 characters in all), and the values never increase from left to right except inside a subtractive pair.
- No subtraction needed. None of the digits of 70 is a 4 or a 9, so LXX is purely additive: just add the symbol values.
- Repetition. XX repeats X two times. I, X, C and M may repeat up to three times in a row; V, L and D never repeat.
Where you will see LXX
- Championship games. Pro football numbers its championship game with Roman numerals, starting from game I in January 1967. Game LXX falls in early 2036.
- Volumes and sequels. Book volumes, conference editions, film sequels and anniversary events often carry a Roman numeral; edition LXX would be the 70th.
Numbers near 70 in Roman numerals
Frequently asked questions
How do you write 70 in Roman numerals?
70 is written LXX. Break it into L (50), X (10), X (10) and add the parts: 50 + 10 + 10 = 70.
What is 70 in Latin?
The Latin cardinal number 70 is “septuaginta.” The Romans wrote it as LXX.
What is LXX plus one?
LXX + I = LXXI (71). Adding one can change the whole ending of a numeral, which is why it helps to convert to digits, add, and convert back.