Roman Numerals

Roman Numerals

I  = 1                   IV = 5 -1 = 4

V = 5                   IX = 10 -1 = 9

X = 10                 XL = 50 – 10 = 40       

L = 50                 XC = 100 – 10 = 90    

C = 100               CM = 1000 – 10 = 900

D = 500

M = 1000

Convert number: 2,020 in Roman numerals, how to write?

1 Break the number (decompose it) into place value subgroups: 2,020 = 2,000 + 20;

2 Convert each subgroup: 2,000 = 1,000 + 1,000 = M + M = MM; 20 = 10 + 10 = X + X = XX;

3 Wrap up the Roman numeral: 2,020 = 2,000 + 20 = MM + XX = MMXX
MMXX is the group of numerals in additive notation