This PowerPoint Presentation could be used as a mini-lesson, introduction, or review of main ideas and details. The purpose of this presentation is to help students to identify the main idea of what they read. The first four slides explain the meaning of the terms "main idea" and "supporting details". The next four slides allow students to apply their knowledge to determine the main ideas and details of two reading passages. Students can underline clue words in the passages on hard copies of the presentation or on a SMARTboard during the lesson.