No. For example, the square root of two plus (minus the square root of two) = 0, which is not an irrational number.
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The closure property of addition says that if you add together any two numbers from a set, you will get another number from the same set. If the sum is not a number in the set, then the set is not closed under addition.
Real Numbers are said to be closed under addition because when you add two Real Numbers together the result will always be a Real Number.
No. Consider the set of odd integers.
Yes, it applies to even multiplication of fractions and rational and irrational numbers.
Commutative property: a + b = b + a; example: 4 + 3 = 3 + 4 Associative property: (a + b) + c = a + (b + c); example: (1 + 2) + 3 = 1 + (2 + 3) Closure property: The sum of two numbers of certain sets is again a number of the set. All of the above apply similarly to addition of fractions, addition of real numbers, and multiplication of whole numbers, fractions, or real numbers.