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80 in Roman Numerals

80 in Roman numerals is LXXX. It breaks down as LXXX, which adds up to 80.

  • Roman numeral
    LXXX
  • Lowercase
    lxxx
  • Breakdown
    LXXX
  • In words
    eighty
  • Binary
    1010000
  • Hexadecimal
    50

How to write 80 in Roman numerals

Roman numerals are built place by place, from the largest value to the smallest. For 80 the places are 80 (tens).

  1. Write 80 as LXXX.

Joined together, LXXX gives LXXX.

80 digit by digit

PlaceValueNumeralRule used
tens80LXXXthe five symbol plus three

Check LXXX by reading it back

Reading LXXX from left to right and adding the pieces: LXXX = 80. Together that is 80, so LXXX and 80 match.

Mistakes to avoid with LXXX

  • Never repeat a symbol more than three times in a row. When a fourth would be needed, the subtractive form takes over.
  • Only I, X and C may be placed before a larger symbol to subtract, so LXXX never contains forms such as VX or LC.
  • Read LXXX 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 80

  • 80 is an even number and composite, with prime factors 24 x 5.
  • In binary 80 is 1010000 and in hexadecimal it is 50.
  • Written out, 80 is "eighty".
  • The digits of 80 add up to 8.

Where you will see 80 in Roman numerals

The number 80 appears as LXXX when denoting specific centuries in history books or in highly structured legal documents. Historians and legal professionals prefer this ancient system because it prevents confusion with dates, page numbers, or other statistics nearby.

Numbers near 80

NumberRoman numeral
78LXXVIII
79LXXIX
80LXXX
81LXXXI
82LXXXII

FAQ

What is 80 in Roman numerals?

80 is written LXXX in Roman numerals. It is built from LXXX (80).

How do you write 80 in lowercase Roman numerals?

Lowercase Roman numerals use the same rules, so 80 is lxxx. Lowercase is common for page numbers in a book's preface and for outline levels.

How do I convert any number to Roman numerals?

Split the number into thousands, hundreds, tens and ones, write each part with the symbols I, V, X, L, C, D and M, then join them from largest to smallest. Or paste it into the Roman numeral converter, which also converts back.

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