IV or IIII = 4
Roman numerals never have 4 of any letter side by side you would not right IIII as 4 it would be IV. The rule is up to three letters are added up when you come to the next number i.e. 4 you move to the next number up 5 V and deduct 1 I.
so the math is I (1) taken from V (5) = 4
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P is not a Roman numeral. IV is the Roman numeral for 4.
I:V::IV:___ I:Ix5:IV:____ I:V::IV:XX
The Roman numeral for four is IV.
iv or IV = 4
The Roman numeral IV represents the number 4 in our modern Arabic numeral system. In Roman numerals, "I" represents 1 and "V" represents 5. When a smaller numeral (I) is placed before a larger numeral (V), it is subtracted from the larger numeral, resulting in 4.