True Core Idea

This clear, structured nonfiction reading worksheet helps students in Grades 4-6 strengthen their ability to identify central ideas and supporting details through careful analysis and classification. Using an informational passage about volcanoes, learners read closely and decide whether each statement represents a true central idea or a supporting detail, reinforcing comprehension, focus, and understanding of scientific texts.

Skills Reinforced

• Central Idea Recognition (Grades 4-6) – Distinguish the most important ideas in a nonfiction passage from descriptive or supporting information.
• Supporting Detail Analysis – Evaluate how facts and examples contribute to explaining a core concept.
• Reading Comprehension & Inference – Use evidence and reasoning to classify statements accurately.
• Science Literacy – Build understanding of natural phenomena through informational reading.

Instructional Benefits

• Teacher-Created Resource – Designed by educators to align with upper elementary ELA and science literacy standards.
• Simple True/False Format – Makes an abstract skill concrete and easy to assess.
• Focus on Evidence-Based Thinking – Encourages students to justify why a statement is central or supporting.
• Flexible Classroom Use – Ideal for independent practice, small groups, review lessons, or assessment.

This printable worksheet helps students sharpen their nonfiction reading skills by clearly separating essential ideas from extra details. By practicing classification with scientific content, learners improve focus, inference, and critical thinking while gaining confidence in informational text analysis. Suitable for classroom instruction or homeschool use, this no-prep activity provides meaningful practice in identifying the true core ideas that anchor understanding in nonfiction reading.

This worksheet is part of our Central Ideas of Text collection.