geometry - How come $32.5 = 31.5$? (The "Missing Square" puzzle.) - Mathematics Stack Exchange
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Missing Square Puzzle
Math Game for Kids: The Missing Middle - Babble Dabble Do
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Missing Square Puzzle
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The Missing Square Puzzle (Video) – Mind Your Decisions
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The Missing Square Problem – Mind Your Decisions
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Math Game for Kids: The Missing Middle - Babble Dabble Do
