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A free and open set of professional development resources for learning and teaching mathematics.

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Student Activity Video: Walking the Number Line

Students use a number line on the floor of the classroom to explore addition and subtraction of integers.



   Link to this movie file.


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This resource was collaboratively designed by OER in Mathematics Professional Development Project partners from Maine RSU#54 & RSU#11 and staff from Education Development Center, Inc. This work is licensed under the Creative Commons Attribution-Non Commercial-Share Alike 3.0 License.