• Partner Takeaway - Subtraction
     
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    Subtraction on the Open Number Line

    The open number line, a number line with no markers, is used to model strategies for subtraction. The strategies students may explore include: 
    • Counting On and Counting Backward;
    • Taking Leaps of Ten;
    • Decomposing to get to a Landmark Number;
    • Adding on vs. Removing; and
    • Using Constant Difference.    
    In these videos, the focus is on Taking Leaps of Ten and Decomposing to get to a Landmark Number.
     
    Video A:
     
     
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    subtractionusingnumberline  
    Video B:
     
     
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    subtraction video part b  
     
    Video C:
     
     
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    subtraction video c