Q: Is 8 closed addition

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No. A number cannot be closed under addition: only a set can be closed. The set of rational numbers is closed under addition.

Quite simply, they are closed under addition. No "when".

Let + (addition) be a binary operation on the set of odd numbers S. The set S is closed under + if for all a, b ϵ S, we also have a + b ϵ S. Let 3, 5 ϵ the set of odd numbers 3 + 5 = 8 (8 is not an odd number) Since 3 + 5 = 8 is not an element of the set of the odd numbers, the set of the odd numbers is not closed under addition.

Yes, the set is closed.

yes

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No. A number cannot be closed under addition: only a set can be closed. The set of rational numbers is closed under addition.

no, not all prime numbers are closed under addition. why? because, when you add 2 prime numbers you will not always get a prime number. example: 5+3= 8 5 and 3 are prime numbers but their sum is 8 which is a composite number..

The set of even numbers is closed under addition, the set of odd numbers is not.

Quite simply, they are closed under addition. No "when".

Let + (addition) be a binary operation on the set of odd numbers S. The set S is closed under + if for all a, b ϵ S, we also have a + b ϵ S. Let 3, 5 ϵ the set of odd numbers 3 + 5 = 8 (8 is not an odd number) Since 3 + 5 = 8 is not an element of the set of the odd numbers, the set of the odd numbers is not closed under addition.

No. Take 7/8 + 1/4 for example. This is 9/8 or 1 1/8, which is not less than 1.

The numbers are not closed under addition because whole numbers, even integers, and natural numbers are closed.

That is correct, the set is not closed.

For a set to be closed under any operation, the result of the operation must also be a member of the set. The result of adding fractions is another fraction, thus it is closed under addition. Remember that 8/3, 8/4, 4/4, 2/1 are all fractions - they have a numerator and denominator separated by a line (at an oblique angle on the computer screen). Improper fractions are still fractions.

It means that given a set, if x and y are any members of the set then x+y is also a member of the set. For example, positive integers are closed under addition, but they are not closed under subtraction, since 5 and 8 are members of the set of positive integers but 5 - 8 = -3 is not a positive integer.

Yes, the set is closed.

yes because real numbers are any number ever made and they can be closed under addition