79 in Roman Numerals
Seventy-nine is written LXXIX in Roman numerals. It uses the subtractive rule, where a smaller glyph placed before a larger one is taken away rather than added, which keeps the numeral short and is the part most people find fiddly.
How LXXIX is formed
Reading left to right, 79 breaks into these additive parts. Each Roman symbol is added in turn to reach the total.
L + X + X + IX = 50 + 10 + 10 + 9 = 79.
Where 79 in Roman numerals is used
- Outlines, exam questions and list items in formal documents.
- Monarch and pope names, for example the 79th of a royal line.
Convert another number
79 is written LXXIX in Roman numerals.
Frequently asked questions
How do you write 79 in Roman numerals?
Write 79 as LXXIX, combining L + X + X + IX. Start from the largest value that fits and work down until nothing is left over.
Why is 79 not written LXXVIIII?
LXXIX uses the subtractive rule: a smaller symbol placed before a larger one is taken away, so you never repeat a symbol four times. LXXVIIII breaks that rule, which is why LXXIX is the only correct form.
What are 78 and 80 in Roman numerals?
78 is LXXVIII and 80 is LXXX. Neighbouring numbers often change length in surprising ways, which is why each has its own page.
How is LXXIX broken down?
LXXIX breaks down as L (50), X (10), X (10), IX (9), so L + X + X + IX = 50 + 10 + 10 + 9 = 79.