Roman Numerals Worksheet
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5Roman Numerals
Pre-requisite: Number System, Addition and Subtraction.
Target Audience: Standard V to Standard VII.
In Syllabus – Standard V.
Revision – Standard VI & VII.
Symbol
Decimal Value
I
One (1)
V
Five (5)
X
Ten (10)
L
Fifty (50)
C
Hundred (100)
D
Five Hundred (500)
M
Thousand (1000)
Rules to decipher roman numerals:
1. Repetition of alphabets means addition.
II = 1 + 1 = 2
III = 1+1+1 = 3
XX = 10 + 10 = 20
XXX = 10+10+10 = 30
2. If a roman alphabet appears to the LHS of another roman alphabet and decimal value of LHS
Roman alphabet is lesser than decimal value of RHS Roman alphabet, the decimal value of LHS is
subtracted from decimal value of RHS. If LHS has repetitions, the according to the rule 1,
repetitions are added first and then subtracted from decimal value of RHS.
IV = 5 – 1 = 4
XL = 50 -10 = 40
X’s decimal value is 10 and L’s decimal value is 50. Since LHS’s (X) decimal value (10) is lesser
than RHS’s (50) decimal value (50), so the resultant decimal value is 50-10=40
.
3.
If a roman alphabet appears to the LHS of another roman alphabet and the decimal value of
LHS Roman alphabet is greater than the decimal value of RHS Roman alphabet, the decimal
values of LHS and RHS are added to get the resultant value. If alphabets are repeated then they
are added first according to the rule 1.
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