79 in Roman Numerals
79 in Roman numerals is LXXIX. It is built from two parts: 70 + 9 = LXX + IX. Read it from left to right and add the values to get 79. Copy it below, see why it is written this way, and check the numbers before and after. The converter handles any number from 1 to 3,999.
79 in Roman numerals is LXXIX.
79 in Roman numerals: the breakdown
| Place value | Numeral | Value |
|---|---|---|
| 70 | LXX | 70 |
| 9 | IX | 9 |
| Total | LXXIX | 79 |
70 plus 9 is 79, so LXX followed by IX is LXXIX.
Why LXXIX and not LXXVIIII?
LXXIX uses the subtractive pair IX. Written by adding only, 79 would be LXXVIIII, but a letter may repeat only three times in a row, and LXXVIIII repeats I four times.
How to read LXXIX
- LXX is 50 + 10 + 10, which is 70.
- IX is 10 minus 1, which is 9.
- Add 70 + 9 to get 79.
The numbers around 79
Facts about 79
- 79 is an odd number.
- 79 is a prime number: it can be divided only by 1 and itself.
- The digits of 79 add up to 16.
- LXXIX is 5 letters long. It uses the symbols L, X and I.
Convert another number
79 = 70 + 9 = LXX + IX
What number is LXXIX?
LXXIX is the number 79. Reading it from left to right, LXX is 70 and IX is 9, which adds up to 79.
Questions and answers
What is 79 in Roman numerals?
79 in Roman numerals is LXXIX. It is made of two parts: 70 + 9 = LXX + IX. Read LXXIX from left to right, add the parts, and you get 79. Use the converter on this page to check any other number from 1 to 3,999.
How do you write 79 in Roman numerals?
Split 79 into its place values, write each one in Roman numerals, and join them from largest to smallest. For 79 that is 70 + 9, which is LXX + IX, so the answer is LXXIX. Check that no letter repeats more than three times in a row.
What number is LXXIX?
LXXIX is 79. Read it in place-value parts from left to right: LXX is 70, IX is 9. Add the parts to get 79. Letters after a larger or equal letter are added, and a smaller letter before a larger one is subtracted. You can also type LXXIX into the converter to read the number back.
Why is 79 written LXXIX and not LXXVIIII?
LXXIX is the standard form. LXXVIIII breaks a rule: a letter may repeat only three times in a row, and LXXVIIII repeats I four times. Writing LXXIX keeps every letter within those limits and makes 79 easy to read at a glance.