Multiplication by 1 leaves a rational number unchanged. Interchanging two rational factors without changing the product is the commutative property.
(i) Multiplicative identity. (ii) Commutative property of multiplication. (iii) Multiplicative identity.
Only the grouping of the three factors changes; their order is unchanged.
Associative property of multiplication of rational numbers.
Rational numbers are closed under multiplication.
The product of two rational numbers is always a rational number.
If $\dfrac{a}{b}>0$, then $\dfrac{b}{a}>0$.
The reciprocal of a positive rational number is positive.
Changing a rational number to its reciprocal does not change its sign.
The reciprocal of a negative rational number is negative.
A reciprocal of 0 would require division by 0, which is not defined.
Zero has no reciprocal.
$1/1=1$ and $1/(-1)=-1$.
$1$ and $-1$ are their own reciprocals.
Write $-1=-\dfrac{6}{6}$ and $0=0$. Fractions with denominator 6 between them give the required numbers.
One set is $-\dfrac{5}{6},-\dfrac{4}{6},-\dfrac{3}{6},-\dfrac{2}{6},-\dfrac{1}{6}$.