Page 28 - Math Skill - 5

26 Maths

MIND MAP

Roman Numerals

Rule 1 Seven basic symbols to write Roman Number
L
X
I
C
M
D
C C C 1 V 10 50 100 500 1000
5

100 100 100
CCC = 100 + 100 + 100 = 300

Rule 3 Rule 5

I V V = 5 × 1000 = 5000
IVXI = 4 × 1000 + 10 + 1
1 5 = 4011
IV = 5 – 1 = 4

Rule 2

C X X
Limitations
100 10 10 In Roman number system, there is no
CXX = 100 + 10 + 10 = 120 �
symbol for zero.
� There is not any place value system.
� Only I, X, C, M can be repeated.

Rule 4 � V, L, D can not be repeated.
C X I V � A symbol can be repeated upto a

maximum number of 3-times.
100 10 1 5 � V, L, D are never subtracted.
CXIV = 100 + 10 + 5 – 1 = 114 � X can be subtracted from L and C only.
� C can be subtracted from D and M only.