This is the 5895th most frequent Russian word.
рекламным
"Advertising" or "promotional."
The word 'рекламных' is used as an adjective describing 'approaches', indicating relation to advertising.
Этот проект был разработан с использованием многочисленных рекламных подходов.
This project was developed using numerous advertising approaches.
The word 'рекламном' is an adjective in its prepositional case, describing 'агентстве', suggesting the industry of the agency.
Она работала в рекламном агентстве несколько лет.
She worked in an advertising agency for several years.
'Рекламными' is the instrumental plural form of the adjective, used to qualify 'вставками', showing the nature of the inserts.