Roman number system

The Roman numeral system is still used today, when writing a century, on monuments, in the names of kings and popes.

This system, based on the Etruscan numbering system, was developed in Ancient Rome. It is made up of capital letters that have different values ​​and is additive, that is, to know what number it is, you have to add the value of each symbol.

1510501005001000
IVXLCDM

The roman number system has the following rules

  • The letters I, X, C, M can be repeated only three times:
    • III = 3
    • XX = 20
    • CCC = 300
    • M = 1000
  • V, L y D can not be repeated
  • A letter with a minor value written at the right side of other add its value:
    • XI = 10 + 1 = 11
  • If it is written at the left side we subtract the value
    • IX = 10 – 1 = 9

Activity 3: Write each number in the roman system

  • John has twenty three cows in his farm
  • The church was built in 1812
  • 3 · 4 + 5
  • The clock says it is six o’clock
  • Five minus one makes
  • Before fifty we have
  • Sara was born in 2006

Activity 4: Write the following numbers in the Roman system.

  • 45
  • 126
  • 3.405
  • 20.381

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