# Are rational numbers closed under multiplication?

Rational numbers are closed under multiplication, because if you multiply any rational number you will get a pattern. Rational numbers also have a pattern or terminatge, which… is good to keep in mind.

# Are rational numbers are closed under addition subtraction division or multiplication?

The set of rational numbers is closed under all 4 basic operations.

# Is the set of rational numbers closed under division and Why?

No. Zero is a rational number, but division by zero is not defined.

# Are real numbers closed under addition and subtraction?

Real numbers are closed under addition and subtraction. To get a number outside the real number system you would have to use square root.

# Are odd numbered sets closed under addition and multiplication?

No. 1 + 3 = 4, which is not odd. In fact, no pair of odds sums to an odd. So the set is not closed under addition.

# Is a rational number closed for addition and for multiplication?

A rational number is not. But the set of ALL rational numbers is.

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# Is this set of negative numbers closed under multiplication or addition?

Yes. The empty set is closed under the two operations.

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# Are the rational numbers closed under multiplication?

Yes.

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In Algebra

# Are rational numbers closed under division multiplication addition or subtraction?

Rational numbers are closed under addition, subtraction, multiplication. They are not closed under division, since you can't divide by zero. However, rational numbers excludin…g the zero are closed under division.

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# What does it mean for a polynomial to be closed under addition subtraction and multiplication?

If you perform any of those operations on a polynomial, the resultwill be a polynomial.

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# Are rational numbers are closed under addition subtraction multiplication and division?

All but division.