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Cách đọc và viết số La Mã [hại não] – How to read and write Roman Numerals

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Roman numerals are expressed by letters of the alphabet:

I=1;  V=5;  X=10;  L=50;  C=100;  D=500;  M=1000

There are four basic principles for reading and writing Roman numerals:

  1. A letter repeats its value that many times (XXX = 30, CC = 200, etc.). A letter can only be repeated three times.
  2. If one or more letters are placed after another letter of greater value, add that amount.

VI = 6 (5 + 1 = 6)

LXX = 70 (50 + 10 + 10 = 70)

MCC = 1200 (1000 + 100 + 100 = 1200)

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