6-8: Educator Resources

Spotlight Resource: Number String on an Open Number Line

In this 7th-grade vignette, students investigate how addition and subtraction shift values along an open number line, using examples, conjectures, and mathematical argumentation to deepen conceptual understanding of rational numbers. Through collaborative work, math talks, and the routine Stronger and Clearer Each Time, students test ideas, justify generalizations, and refine their reasoning as they explore how operations affect number placement, including with negative values.

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