27 in Roman numerals, how to write?

27 = XXVII
26 = ? ... 28 = ?
Explanations below.

Roman numerals used to make the conversion:


I = 1; V = 5; X = 10;

Reading rules

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

27 = 20 + 7;

2. Convert each subgroup:

20 = 10 + 10 = X + X = XX;
7 = 5 + 1 + 1 = V + I + I = VII;

3. Wrap up the Roman numeral:

27 = 20 + 7 = XX + VII = XXVII;

Final answer:


27 = XXVII

In Roman numerals, how to write:
26 = ? ... 28 = ?

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Roman numerals reading rules, summary: