Do you really master Roman numerals?
Do you really master Roman numerals?
I
V
X
as diX
L
C
like a hundred
D
M
IV; IIII
Both are possible but IV is more common.
IX
-1 + 10
XL
-10 + 50
XC
-10 + 100
CD
-100 + 500
CM
-100 + 1000
1871
M=1000
D=500
CCC=300
L=50
XX=20
I=1