Fig. 2: Mean correct responses per minute across various item level features. Shading represents one standard error. | npj Science of Learning

Fig. 2: Mean correct responses per minute across various item level features. Shading represents one standard error.

From: Tablet-based arithmetic fluency assessment reveals developments in math cognition and math achievement from childhood to adolescence

Fig. 2

a Overview of fluency as measured by correct responses per minute as a function of problem size and operation. Each line represents a grade cohort. b Differences in single-digit fluency by problem type (common or exceptional) across the six grade levels represented in the sample.

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