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.
CLIX is the number 159 in Roman numerals.
XIII is the number 13 in Roman numerals.
XX is the number 20 in Roman numerals.
L is the number 50 in Roman numerals.