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This study explores how four preservice teachers with diverse backgrounds learned to notice students’ understanding of Identical Units, a key concept in measurement. Findings suggest that when provided with various learning opportunities specifically designed to support their noticing, all participants showed development. However, they followed different learning paths: Alina experienced rapid improvement in both attention and interpretation, Bryn followed a slower developmental trajectory, Kendall improved her attention prior interpretation, and Megan’s noticing initially declined before progressing. I conclude with a discussion of the study’s practical and theoretical implications, as well as directions for future research.