Question
# Write${\text{(i)}}$ The rational number that does not have a reciprocal.${\text{(ii)}}$ The rational numbers that are equal to their reciprocals. The rational number that is equal to its negative.
${\text{(i)}}$ The rational numbers that do not have a reciprocal is 0 because when we take its reciprocal, it will become $\dfrac{1}{0}$ which is not defined.
${\text{(ii)}}$ The rational numbers that are equal to their reciprocals are 1 and $- 1$ because the reciprocal of 1 is $\dfrac{1}{1} = 1$ itself and the reciprocal of $- 1$ is $\dfrac{1}{{ - 1}} = - 1$ itself.