The Roman numeral "IV" represents the number four. Roman numerals were developed by the Romans to indicate numbers in trade and commerce. This numeral system has lasted centuries, and it is used in modern times.
The first four numbers are represented by I, II, III and IV, and V represents the number five. X represents the number ten; L represents fifty; and, C is short for centum, which means one hundred in Latin. This Latin word is used in modern times in the word century, which means one hundred years.
When writing Roman numerals, placing a smaller value in front of a larger value number means that the first number is subtracted from the second. For example, IV is four because V is five and I is equal to one.