A randomized controlled trial of interleaved mathematics practice
We checked this card's citation and the finding we state against the source's own page or record in October 2026.
What it found
Seventh-grade classes that periodically did interleaved assignments for four months outscored classes that did blocked assignments on an unannounced test a month later. Teachers carried it out without training and supported it in an anonymous survey taken before they knew the results.
Effect size, as the source reports it: 61% vs 38% on an unannounced test a month later, d = 0.83.
What kind of study it is
- Design
- Randomized trial in schools
- Weight
- A trial in schools: it compares groups that got the practice with groups that didn't.
- Sample
- 54 seventh-grade math classes, cluster randomized, pre-registered
- Who
- School-age children (K–12)
Read it
doi.org/10.1037/edu0000367 · ERIC record EJ1237752
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Cited in the Library
Cite this study
Rohrer, D., Dedrick, R. F., Hartwig, M. K., & Cheung, C.-N. (2020). A randomized controlled trial of interleaved mathematics practice. Journal of Educational Psychology, 112(1), 40–52. https://doi.org/10.1037/edu0000367
Checked against the source in October 2026. All studies · How we rate the evidence · Something wrong? Tell us.