Yes, but only when the denominator is non-zero. Division by 0 is not defined.
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Yes. The set of real numbers is closed under addition, subtraction, multiplication. The set of real numbers without zero is closed under division.
No, the natural numbers are not closed under division. For example, 2 and 3 are natural numbers, but 2/3 is not.
A set of real numbers is closed under subtraction when you take two real numbers and subtract , the answer is always a real number .
Irrational numbers are not closed under any of the fundamental operations. You can always find cases where you add two irrational numbers (for example), and get a rational result. On the other hand, the set of real numbers (which includes both rational and irrational numbers) is closed under addition, subtraction, and multiplication - and if you exclude the zero, under division.
The set of rational numbers is closed under all 4 basic operations.