“…Despite that all of the curriculum series were selected because they were reported to align to the CCSS‐M, the range of curricular approaches may have contributed to the great variation across the characteristics of the writing prompts in the student books. However, given that curriculum resources are used as guides for instruction (Banilower et al, ), and “[s]urveys revealed teachers rarely provided students opportunities to write in mathematics compared to other content areas“ (Powell, Hebert, Cohen, Casa, & Firmender, , p. 518), the results of the current study further suggest that the mathematics education field could benefit from more explicit guidance about mathematical writing.…”