12 in Roman numerals, how to write?

12 = XII
11 = ? ... 13 = ?
Explanations below.

Roman numerals used to make the conversion:


I = 1; X = 10;

Reading rules

1. Break the number (decompose it) into place value subgroups:

12 = 10 + 2;

2. Convert each subgroup:

10 = X;
2 = 1 + 1 = I + I = II;

3. Wrap up the Roman numeral:

12 = 10 + 2 = X + II = XII;

Final answer:


12 = XII

In Roman numerals, how to write:
11 = ? ... 13 = ?

In Roman numerals online converter

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Roman numerals reading rules, summary: