This is a hands-on reading comprehension activity. Fill mystery bags with items then students figure out the main idea of the bag. There are also
Main idea mystery bag
Lucky Little Learners - F⚈R⚈E⚈E⚈ Main Idea Mystery Bags activity in this blog post!
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Main Idea Freebies
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10 GREAT Activities to Teach Main Idea and Details
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Main idea mystery bags
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Simply Creative Teaching - One of my favorite introductory activities for main idea are mystery bags! Find all the details here