Why is there no zero in Roman numerals?
Roman numerals have no zero because they were designed for counting and recording amounts, not for place-value math. The Romans used the word nulla, meaning none, when they needed it.
Roman numerals add and subtract symbols, so the position of a digit does not change its value the way it does in our system. In 205, for example, the zero holds the tens place empty. Roman numerals simply write CCV, with no need for a placeholder. That made zero unnecessary for everyday counting.
Romans did most calculations on counting boards or the abacus, then wrote the result in numerals. An empty column on an abacus already showed nothing, so there was no need for a written zero. When monks calculated the dates of Easter in the 500s and 600s, some used nulla or the letter N to mean zero.
Where zero came from
Zero as a true number with its own symbol developed in India. Around the year 628, mathematician Brahmagupta wrote rules for calculating with zero. The idea spread through the Arab world and reached Europe in the 1200s, partly through the work of Fibonacci, eventually replacing Roman numerals for math.
Did You Know?
The Babylonians and the Maya also developed placeholder symbols for zero independently, long before it reached Europe.