What are negative numbers?
Numbers don't just stop at zero. When you count backwards from zero, you go into negative numbers.
Positive numbers are more than zero: 1, 2, 3, 4, 5, etc.
Negative numbers are less than zero: -1, -2, -3, -4, -5, etc.
A number line can be used to order negative and positive numbers.
Zero, 0, is neither positive nor negative.