This interactive SMARTboard lesson begins with a mini lesson on what the main idea of a paragraph is and how the details in the paragraph need to support the main idea. There are practice paragraphs and students will choose details that support the main idea AND they will determine if any unnecessary sentences that were off topic need to be deleted. Also included are 8 printable PDF's of graphic organizers that students can use to show main ideas and details of their own. The mini lesson includes answer slides with some brief explanations. Created with Smart Notebook 11. Great for grades 3-6. Can easily be used to introduce the skill, practice the skill, or remediate the skill.