X = 10
The number 30 is XXX in Roman numerals, as each X equals 10.
X= Ten in roman numerals
CXXI. In Roman Numerals, C equals 100 and X equals 10 and I equals 1. Therefore 121 would be CXXI or 100+10+10+1.
Arabic(Modern) = 11 Roman = XI Here are the first 20 Roman Numerals 1 = I 2 = II 3 = III 4 = IV ( or IIII on classic dials of clocks). 5 = V 6 = VI 7 = VII 8 = VIII 9 = IX 10 = X 11 = XI 12 = XII 13 = XIII 14 = XIV 15 = XV 16 = XVI 17 = XVII 18 = XVIII 19 = XIX 20 = XX NB The first ;12; numbers you will find on analogue clocks with a classic dial.
XL is equivalent to 40 in Roman numerals, and X represents 10. Thus, XL plus X is 40 + 10, which equals 50. In Roman numerals, 50 is represented by the letter L.
X minus IV equals VI (10-4=6)
176 = CLXXVI in Roman numerals
CCCLVI represents the number 356.
"D" in Roman Numerals equals 500.
The Roman numerals MMX divided by X equals CCI (2010/10 = 201)
10 in Roman numerals is represented by the letter "X".
1545 equals to MDXLV in roman numerals. Thank you