This easy worksheet builds first-grade vocabulary for finding the big idea by tracing six key reading words: topic, main, detail, clue, fact, and idea. Kids then complete fill-in-the-blank sentences like "The main ___ tells what a story is about" and "We look for ___ to find the main idea," and decide true or false on statements such as "Supporting details are not related to the main idea" and "A story can have more than one supporting detail." The mix of tracing, writing, and reasoning anchors the language young readers need before tackling a real passage.