hello!
In order to find the reciprocal of a number, we should flop it over.
In order to find the reciprocal of a fraction, then the numerator & denominator switch places.
Kindly consult the following formula for more details:-
![\sf{The~reciprocal~of~a~is~\displaystyle(1)/(a)}](https://img.qammunity.org/2021/formulas/mathematics/college/4006fsvqae6c2x44ydmummx12z4e3gosur.png)
![\sf{The~reciprocal~of~\displaystyle(a)/(b) ~is~(b)/(a)}](https://img.qammunity.org/2021/formulas/mathematics/college/s7i8k9m4z32ijvjst9m59eatt6r7uqacxr.png)
According to the formula, the reciprocals are;-
![\sf{Reciprocal \ of \ 18:-{\boxed{\displaystyle(1)/(18)}}](https://img.qammunity.org/2021/formulas/mathematics/college/q77wfbxzdssoaxqrbh693zv2z1re2vydxm.png)
![\sf{Reciprocal~of~\displaystyle(2)/(3):- {\boxed{(3)/(2)}](https://img.qammunity.org/2021/formulas/mathematics/college/jsencnx76sxkjcmy0d3r7qfe0ljkhuhmk3.png)
note:-
Hope everything is clear; if you need any clarification/explanation, kindly let me know, and I will comment and/or edit my answer :)