Both the phrases “My five cents” or “put in one’s two cents’ worth” are used when one wants to give one’s opinion on some topic.
From TV shows, movies and novels
The Bold and the Beautiful
John McCook(Eric Forrester) used the phrase “put in one’s two cents’ worth” while talking to Ashley Jones (Bridget Forrester) in the popular TV show “The Bold and the Beautiful” as shown below:
From the web:
Following are some lines taken directly from the net to show the usage of the phrase “My five cents” in everyday talk.