Fill in the blanks in the following table:

Numbers	Closed under
	Addition	Subtraction	Multiplication	Division
Rational numbers	Yes	Yes		No
Integers		Yes		No
Whole numbers	...		Yes
Natural numbers		No

If a property holds for rational numbers, will it also hold for integers? For whole Numbers? Which will? Which will not?

Mention the rational number that does not have reciprocal.

Mention the rational numbers that are equal to their reciprocals.

Mention the rational number that is equal to its negative.

Zero has ______ reciprocal.

The numbers ______ and ______ are their own reciprocals.

The reciprocal of –5 is ______.

The reciprocal of 1/x, where x # 0 is

The product of two rational numbers is always a ___________.

The reciprocal of a positive rational number is _________.