22 in Roman numerals, how to write?

22 = XXII
21 = ? ... 23 = ?
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:

22 = 20 + 2;

2. Convert each subgroup:

20 = 10 + 10 = X + X = XX;
2 = 1 + 1 = I + I = II;

3. Wrap up the Roman numeral:

22 = 20 + 2 = XX + II = XXII;

22 = XXII

In Roman numerals, how to write:
21 = ? ... 23 = ?

In Roman numerals online converter

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