19 in Roman numerals, how to write?

19 = XIX
18 = ? ... 20 = ?
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:

19 = 10 + 9;

2. Convert each subgroup:

10 = X;
9 = 10 - 1 = X - I = IX;

3. Wrap up the Roman numeral:

19 = 10 + 9 = X + IX = XIX;

Final answer:


19 = XIX

In Roman numerals, how to write:
18 = ? ... 20 = ?

In Roman numerals online converter

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Roman numerals reading rules, summary: