Using the Number Line to Develop Understanding of Whole Number Magnitude and Operations.

This article focuses on how teachers can use number lines to support students with or at risk for learning disabilities (LD) in mathematics, particularly in developing number sense and computational strategies for addition and subtraction. It outlines research-based practices for integrating number lines with other mathematical models to build conceptual understanding of numerals, number magnitude, and arithmetic operations within whole numbers, emphasizing early grades (kindergarten through second grade). The article details instructional strategies such as using manipulatives alongside number lines, teaching counting on and counting up methods, and employing open number lines for multi-digit computations and regrouping. Overall, number lines are presented as a versatile tool that connects concrete and abstract mathematical representations, aiding students with LD in building foundational math skills and progressing toward more complex concepts.