Question

Are there any rational numbers which are their own multiplicative inverses

Answer 1

$\sf{\underline\blue{Answer:-}}$

1 and -1 are the only rational numbers which are their own reciprocals. No other rational number is its own reciprocal. We know that there is no rational number which when multiplied with 0, gives 1. Therefore, rational number 0 has no reciprocal or multiplicative inverse.