This mixed-method study examines the relationship between classroom discussion and student performance in twenty 3rd and 4th grade classrooms in northern California with 50% English language learners (ELLs). Discussions were scored on features including use of multiple approaches for solving problems, students’ opportunities to speak, equitable participation, explanations, and connections between ideas. A linguistically-modified math assessment measured student performance. Quantitative analysis using hierarchical linear modeling (HLM) showed that the discussion features variety of approaches and equitable participation significantly contributed to the explanation of between-class variation in assessment scores, above and beyond that explained by prior mathematics performance and English proficiency. Importantly, mathematical discussion was equally beneficial for students classified as ELLs and those not classified as ELLs. Two classroom vignettes illustrate the different features of discussion and offer insight into ways ELLs contributed to the discussion in different contexts.

Many researchers have illustrated the multi-faceted nature of classroom mathematics discussions, but few have demonstrated the effect of discussion on students’ assessment performance. We developed and employed a discussion observation instrument in 20 third and fourth grade classrooms in an economically disadvantaged, linguistically diverse school district and used hierarchical linear modeling (HLM) to determine whether between-class variation in word-problem-test scores can be explained by levels of class discussion. Results suggest overall class discussion scores, as well as two specific discussion features, variety of approaches and opportunities to speak, are significantly related to test performance. These results suggest classroom instruction including high-level math discussion may improve students’ performance on written measures of achievement.