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Description
This 21-page guide helps educators lead an optical-illusion math investigation with children ages 6–12. Children describe what they notice, predict which lines or shapes look longer or larger, then compare or measure to test their ideas and explain the results. Use the planning prompts, printed illusion patterns, comparison cards, ruler-based checks, and graph-paper recording suggestions for a small-group math or science inquiry. It is designed to build estimation, measurement, comparison, and evidence-based reasoning while welcoming different predictions as starting points for investigation.
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