hello!
In order to find the reciprocal of a number, we should just flop it over.
If we have a fraction, then the numerator & denominator switch places.
Please consult the following formula for more details:-

According to the formula, the reciprocal of 80 is:-

Decimal form:-

note:-
Hope everything is clear; if you need any clarification/explanation, kindly let me know, and I will comment and/or edit my answer :)