Lesson 3 What are Roman numerals There are 7 Roman numerals I 1 V 5 X 10 L 50 C 100 D 500 M 1000 How do Roman numerals work To add place one or more numerals of equal or lesser value after a numeral ID: 493280
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Slide1
Roman Numerals
Lesson 3Slide2
What are Roman numerals?
There are 7 Roman numerals.
I = 1
V =
5
X = 10
L = 50
C = 100
D = 500
M = 1,000Slide3
How do Roman numerals work?
To add, place one or more numerals of equal or lesser value after a numeral.
3
III (I+I+I)
6
VI (V+I)
105
CV (C+V)Slide4
How do Roman numerals work?
To subtract, place a smaller numeral before a larger one.
9
IX (I – X)
4
IV (I – V)Slide5
Subtraction
There are some rules about subtraction.
I, X and C (1, 10, 100) are the only numerals that can be subtracted.
I can only be subtracted from V and X.
X can only be subtracted from L and C.
C can only be subtracted from D and M.Slide6
Subtraction
I
V
X
L
C
D
M
I
X
CSlide7
How to write Roman numerals
Break down a number into its places: tens, hundreds, thousands
Write each section in Roman numerals
Arrange the results left-to-right.
46
40 + 6
XL + VI
XLVI
125
100+20+5
C+XX+V
CXXVSlide8
Let’s practice!
53
178
29
543
2011
50 + 3 LIII
100 + 70+ 8 CLXXVIII
20 + 9 XXIX
500+40+3 DXLIII
2,000 + 10 + 1 MMXI