True or false: closure

Exercise and reference answers

Questions

1. Statement is true

   Yes

   Statement

   Rational numbers are closed under addition.

2. Statement is true

   Yes

   Statement

   Rational numbers are closed under subtraction.

3. Statement is true

   Yes

   Statement

   Rational numbers are closed under multiplication.

4. Statement is true

   Yes

   Statement

   Closure means the result is still a rational number.

5. Statement is true

   No

   Statement

   Closure means the answer is always a whole number.

Explanation