For the same reason 10 equals ten in the Latin alphabet. It is a symbol for a number. That is; 10 is not a number, it is merely the symbolic representation of the number we now call ten.
The origin of the symbol can be traced to the Greek alphabet, where the symbol X was known as the letter chi. The Etruscan alphabet inherited the symbol and, it is thought, it became associated with the number ten through their use of tally-sticks, where a single notch represented a unit (which became I), and every fifth notch was double cut (making an inverted V) and every tenth was cross-cut (making an X). When the Romans arrived, it is thought they derived I, V and X from these symbols. Thus the Roman numeral X came to be associated with the number we call ten.
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.
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.
10 in Roman numerals is represented by the letter "X".
X minus IV equals VI (10-4=6)
In Roman numerals, the letter "X" represents the value of 10. Therefore, "xccxxxc" would be translated as 100 + 10 + 10 + 10 + 100, which equals 230.
X = 10
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.
The number 30 is XXX in Roman numerals, as each X equals 10.
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.
10 in Roman numerals is represented by the letter "X".
X minus IV equals VI (10-4=6)
In Roman numerals, the letter "X" represents the value of 10. Therefore, "xccxxxc" would be translated as 100 + 10 + 10 + 10 + 100, which equals 230.
10 10 1991 in Roman numerals is X X MCMXCI.
The number 10 in Roman numerals is X.
The letter "X" stands for the number 10.
In Roman numerals, "XXXIX" represents the number 39. This is derived by adding the values of each Roman numeral symbol: "X" (10) + "X" (10) + "X" (10) + "IX" (9). Therefore, XXXIX equals 39 in our modern decimal system.
Eleven in Roman numerals is XI.Eleven in Roman numerals is XI.Eleven in Roman numerals is XI.Eleven in Roman numerals is XI.Eleven in Roman numerals is XI.Eleven in Roman numerals is XI.Eleven in Roman numerals is XI.Eleven in Roman numerals is XI.Eleven in Roman numerals is XI.