Websites that have reading comprehension material include K12Reader.com, Education.com and HaveFunTeaching.com. K12 Reader offers reading comprehension worksheets for kindergarten through 10th grade as of 2015. It also offers specific reading-related tasks designed to improve recognizing context clues, figurative language, making inferences, story elements and points of view.
Education.com has worksheets and printables for reading comprehension. These are offered for kindergarten through high school, and other free materials include lesson plans, science fair projects, activities for kids and learning games.
Have Fun Teaching provides reading comprehension materials for students up to grade six. It also offers study tools such as flash cards, common core-related material, customizable create-your-own worksheets and vocabulary activities.