| Summary: | Approximately, 283 sixth-grade students completed four randomly generated Math Curriculum–Based Measures (M-CBMs) from interventioncentral.org twice during a fall semester. These M-CBMs measured foundational skills in addition, subtraction, multiplication, and division. We found that using mean fluency or accuracy scores from four M-CBMs produced more reliable test–retest estimates (e.g., r =.86–.88) in comparison with using individual scores (e.g., r =.55–.73). We also found that aggregated (mean or median) and individual M-CBM scores were strongly correlated (e.g., r =.82–.85) with the Palmetto Achievement Challenge Test (PACT) math section, an annual state standardized test. However, only aggregated M-CBMs produced efficient cut scores useful in detecting students who would pass or fail the PACT. © Hammill Institute on Disabilities 2018.
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