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3rd Grade » Videos


Subtraction Strategies

Added Sep 15, 2016
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This video shows a major component of Common Core. Students need to make sense of what they're doing and avoid routine math steps that cause mathematical confusion.
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  • 2:36 Horizontal Subtraction Made Efficient and Understandable

    In this example, the standard horizontal algorithm is turned into a number line giving students a method of solving subtraction without regrouping nonsense. Students focus on the difference between the two numbers and not isolating single digits with regrouping.

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