This a set of 20 passages that have one sentence that is considered "unnecessary information". I use these task cards in stations and require the students to identify the passage's main idea and then have them choose the sentence that does not pertain to the main idea. You could also have this card set laminated and have students use dry erase markers to mark out the sentence that would be considered "unnecessary information". You could also use these task cards for a SCOOT game.
So many possibilities!