How does a vinculum change the value of a Roman numeral?

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Two vertical tablets display ancient symbols for the numbers one and ten from Egyptian hieroglyphic, Egyptian hieratic, Sumerian, and Cretan scripts, with each symbol shown in red next to its culture and approximate date. — numerals and numeral systems Examples of ancient symbols for the numbers 1 and 10.

In the context of Roman numerals, a vinculum—also referred to as a virgula—is a horizontal bar placed over a numeral to indicate that its value should be multiplied by 1,000.1

For example, if a bar is placed over the numeral V (which represents 5), the resulting value becomes 5,000. This method was developed toward the end of the Roman Republic to facilitate the representation of larger numbers, and its use persisted into the Middle Ages. Additionally, the vinculum also came to be used to represent ordinal numbers.1