0 - Zero
0 means 'none' or 'nothing,' and it is one of the most important ideas in math.
Why this number matters
Without zero, modern arithmetic, algebra, and computing would break.
Background / history
Zero emerged in ancient civilizations and transformed place-value notation.
Simple example
Adding 0 does not change a number: 25 + 0 = 25.
Key Facts
- Additive identity
- Essential for decimal positional systems
Fun fact
Zero is the additive identity.