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roman numerals
 ss = ½ or 0.5 I or i = 1 V or v = 5 X or x = 10 L or l = 50 C or c = 100 D or d = 500 M or m = 1,000

Examples of roman numerals:
I = 1
II = 2
III = 3
IV = 4
V = 5
VI = 6
VII = 7
VIII = 8
IX = 9
X = 10
XI = X + I = 10 + 1 = 11
XII = X + II = 10 + 2 = 12
XIII = X + III = 10 + 3 = 13
XIV = X + IV = 10 + 4 = 14
XV = X + V = 10 + 5 = 15
XVI = X + VI = 10 + 6 = 16
XVII = X + VII = 10 + 7 = 17
XVIII = X + VIII = 10 + 8 = 18
XIX = X + IX = 10 + 9 = 19
XX = X + X = 10 + 10 = 20
XXII = XX + II = 20 + 2 = 22
XXXVI = XXX + VI = 30 + 6 = 36
IIss = 2½ = 2 + 0.5 = 2.5
L = 50
IL = 49
LI = 51
XL = 40
LX = 60
LVIII = L + VIII = 50 + 8 = 58
LXIV = LX + IV = 60 + 4 = 64
C = 100
IC = 99
CI = 101
XC = 90
CX = 110
CCCXXXIII = CCC + XXX + III = 300 + 30 + 3 = 333
CXCVI = C + XC + VI = 100 + 90 + 6 = 196
D = 500
ID = 499
DI = 501
XD = 490
DX = 510
CD = 400
DC = 600
DV = D + V = 500 + 5 = 505
CDXLIV = CD + XL + IV = 400 + 40 + 4 = 444
M = 1000
IM = 999
MI = 1001
XM = 990
MX = 1010
CM = 900
MC = 1100
MCCI = MC + CI = 1100 + 101 = 1,201
MCCI = M + CC + I = 1000 + 200 + 1 = 1,201
MCMXCVII = M + CM + XC + VII = 1000 + 900 + 90 + 7 = 1,997
MCMXCIX = M + CM + XC + IX = 1000 + 900 + 90 + 9 = 1,999

The most common sizes of bottles used by pharmacies to dispense syrups and other liquid medications:
 II which means 60 mL (2 times 30 mL) III which means 90 mL (3 times 30 mL) IV which means 120 mL (4 times 30 mL) VI which means 180 mL (6 times 30 mL) VIII which means 240 mL (8 times 30 mL) XII which means 360 mL (12 times 30 mL) XVI which means 480 mL (16 times 30 mL)

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