numbers below zero are called negative numbers.
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negative or - number
Rational numbers are closed under addition, subtraction, multiplication. They are not closed under division, since you can't divide by zero. However, rational numbers excluding the zero are closed under division.
There are several; the most well-known are probably the set of rational numbers without zero, the set of real numbers without zero, and the set of complex numbers without zero.
The answer is zero !
A set can be closed or not closed, not an individual element, such as zero. Furthermore, closure depends on the operation under consideration.