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  
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