The number line is a powerful tool for supporting students' understanding of fraction magnitude. Fractions are a critical component of mathematics instruction in the elementary and intermediate grades. More specifically, understanding fraction magnitude is central to mathematical development. Yet, fractions are challenging for many students, particularly students with or at risk of learning disabilities (LD) in mathematics. This article shares: (a) key recommendations when planning and implementing fraction number line instruction, (b) sample fraction number line activities for supporting students' understanding of fraction magnitude and overall mathematics achievement, and (c) strategies for helping students grasp the abstract number line representation.