13 in Roman numerals, how to write?

13 = XIII
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:

13 = 10 + 3;

2. Convert each subgroup:

10 = X;
3 = 1 + 1 + 1 = I + I + I = III;

3. Wrap up the Roman numeral:

13 = 10 + 3 = X + III = XIII;

13 = XIII

In Roman numerals online converter

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