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Roman Numerals

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Roman numeration is a base ten system. This is shown in the way people count by ... buildings, some gravestones, and the pages that preface chapters of a book. ... – PowerPoint PPT presentation

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Title: Roman Numerals


1
Roman Numerals
  • By Amber K. Wozniak

2
What are Arabic Numerals?
  • Briefly, Arabic numeration is the technical term
    for the numerals that we use.
  • The numeral figures include 1, 2, 3, 4, 5, 6, 7,
    8, 9, and the 0 (zero).

3
What are Roman Numerals?
  • Roman numeration is a base ten system. This is
    shown in the way people count by fingers (there
    are 10 fingers to two hands).
  • Roman numerals are the letters I, V, X, L, C, D,
    and M combined in specific orders to represent
    numbers.

4
Whats so Great about Roman Numerals?
  • Roman numerals are found on clock faces,
    buildings, some gravestones, and the pages that
    preface chapters of a book.
  • Knowing how to write out Roman numerals will help
    you understand addition and subtraction better.

5
The Figures
  • I 1
  • V 5
  • X 10
  • L 50
  • C 100
  • D 500
  • M 1000
  • Something extra Adding a line above any figure
    other than I means that you multiply that numeral
    by 1,000

6
Rules of Roman Numerals
  • Never put more than three of the same figure
    together.
  • Placing a numeral to the left of a larger
    numeral, like IV, it means that one is taken
    away, or subtracted, from five.
  • It is not IIII, but IV
  • A numeral subtracted can only be two place values
    away from the larger numeral.
  • You can not take 1 away from 50 to get 49. You
    must take 40 (50-10) and combine it with 9 (10-1)

7
Example 1
  • Converting Arabic numerals into its Roman
    numeral, using addition properties
  • 3 III (111)
  • 6 VI (51)
  • 57 LVII (50511)
  • 231 CCXXXI (1001001010101)

8
Example 2
  • Converting Arabic numerals into Roman numerals,
    using rules for subtraction
  • 4 IV (5-1 or 1 taken away from 5)
  • 9 IX (9-1 or 1 taken away from 10)
  • 40 XL (50-10 or 10 taken away from 50)
  • 199 CXCIX (100100-1010-1)

9
Practice converting Roman and Arabic numerals
from one to the other
  • Roman numerals to Arabic form
  • Arabic form to Roman numerals

10
Web Sites to visit for more practice or any extra
information you would like to look at
  • Nova Roma
  • Math Forum
  • Legion XXIV
  • Cool Math 4 Kids
  • Roman Numerals Quiz
  • Learning Roman Numerals
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