Roman Numerals This is the entrance to the Colosseum in Rome.

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Presentation transcript:

Roman Numerals This is the entrance to the Colosseum in Rome. If you look carefully you can see the numbers around the entrance. The Romans used a number system based on the following symbols. I V X L C D M Any idea what they’re worth? 1 5 10 50 100 500 1000

How to read Roman Numerals A letter repeats its value that many times (XXX = 10+10+10 = 30, CC = 100 + 100 = 200, etc.). A letter can only be repeated three times. 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) If a letter is placed before another letter of greater value, subtract that amount. IV = 4 (5 – 1 = 4) XC = 90 (100 – 10 = 90) CM = 900 (1000 – 100 = 900)

Roman numerals are still used today. Can you read them in these modern examples? Pope Benedict XVI

8 2004 16 12 2008 Roman numerals are still used today. Can you read them in these modern examples? Pope Benedict XVI 8 2004 16 12 2008