This exercise contains several informational paragraphs with the main idea presented in a variety of different ways. It's meant to get students thinking about the main idea as the “message” of the paragraph instead of just an easy-to-find sentence. The reasoning was that this would help them not only with main idea, but with inference and summary later on. Included are 30 main idea paragraph cards, an answer key, student response sheets and a vocabulary guide for words in bold.
This is actually the second of a set of three activities, each with an increasing level of difficulty; the first set is "Understanding the Main Idea" and the third is "Inferring Main Idea".