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12 in Roman Numerals

12 in Roman numerals is XII. It breaks down as X + II, which adds up to 10 + 2 = 12.

  • Roman numeral
    XII
  • Lowercase
    xii
  • Breakdown
    X + II
  • In words
    twelve
  • Binary
    1100
  • Hexadecimal
    C

How to write 12 in Roman numerals

Roman numerals are built place by place, from the largest value to the smallest. For 12 the places are 10 (tens), 2 (ones).

  1. Write 10 as X.
  2. Write 2 as II.

Joined together, X + II gives XII.

12 digit by digit

PlaceValueNumeralRule used
tens10Xone symbol
ones2IIthe symbol repeated twice

Check XII by reading it back

Reading XII from left to right and adding the pieces: X = 10, II = 2. Together that is 10 + 2 = 12, so XII and 12 match.

Mistakes to avoid with XII

  • 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 XII never contains forms such as VX or LC.
  • Read XII 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 12

  • 12 is an even number and composite, with prime factors 22 x 3.
  • In binary 12 is 1100 and in hexadecimal it is C.
  • Written out, 12 is "twelve".
  • The digits of 12 add up to 3, so it is divisible by 3.

Where you will see 12 in Roman numerals

You encounter the number 12 displayed as XII at the top of analog clock faces and on some building cornerstones. Clocks place this Roman numeral prominently to mark the start of the dial cycle, continuing a long tradition of formal timekeeping design.

Numbers near 12

NumberRoman numeral
10X
11XI
12XII
13XIII
14XIV

FAQ

What is 12 in Roman numerals?

12 is written XII in Roman numerals. It is built from X (10), II (2).

How do you write 12 in lowercase Roman numerals?

Lowercase Roman numerals use the same rules, so 12 is xii. 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.

More roman numerals