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Reference.org
Three-part lesson
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<p>A three-part lesson is an <a href="/facts/Inquiry-based_learning/M7wGswXs">inquiry-based learning</a> method used to teach mathematics in <a href="/facts/K%E2%80%9312_(education)/FKtI5sC0">K–12</a> schools. The three-part lesson has been attributed to John A. Van de Walle, a mathematician at <a href="/facts/Virginia_Commonwealth_University/9SDImvCV">Virginia Commonwealth University</a>. </p>