M = 1000
D = 500
C = 100
X = 10
I before X means subtract 1
→ MDCXXIX = 1000 + 500 + 100 + 10 + 10 + -1 + 10 = 1629
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I is the number 1 in Roman numerals.
XIII is the number 13 in Roman numerals.
CLIX is the number 159 in Roman numerals.
XX is the number 20 in Roman numerals.
The number 2010 in Roman numerals is MMX