XL=400 * * * * * No. XL is the Roman number 40. 400 is CD.
It is: CD = 500-100 = 400
400 = CD
400
It is: (CD) which means 1000*400 = 400,000
CD = 400
CD-D
CD = 400
Compact Disc or CD which is equal to 400.
400 (500-100)
If you mean CD plus DC then in Roman numerals they add up to M meaning 400 plus 600 = 1000
The roman numerals "CD" represent the number 400. It is formed by combining the symbols for 100 (C) and 500 (D) with a subtraction rule, resulting in a value of 500 - 100 = 400.