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Common Core Subtraction Strategies by Kristen Waddell | TpT
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How Long Does It Take A 3rd Grade Student To Do A Common Core Math Problem?
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Common Core Subtraction to 10 {manipulatives included} by Tara West
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Common Core Subtraction Strategies by Kristen Waddell | TpT
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Common-Core Subtraction: Teaching Many Methods | Common core
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Common Core Subtraction to 10 {manipulatives included} by Tara West
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The debate over Common Core - CBS News
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Subtraction Strategies for the Common Core by Jennifer Bates | TpT