Achievement Effects of Four Early Elementary Math Curricula (IES cluster RCT) - Agodini, R.; Harris, B.; Seftor, N.; Remillard, J.; Thomas; M. (Mathematica for IES) (2013)
rct; evidence grade B

Foundations for Success: The Final Report of the National Mathematics Advisory Panel - National Mathematics Advisory Panel (2008)
review; evidence grade C

Mathematics Instruction for Students with Learning Disabilities: A Meta-Analysis of Instructional Components - Gersten, R.; Chard, D. J.; Jayanthi, M.; Baker, S. K.; Morphy, P.; Flojo, J. (2009)
meta-analysis; evidence grade C

Assisting Students Struggling with Mathematics: Intervention in the Elementary Grades (WWC Practice Guide 2021006) - What Works Clearinghouse expert panel (Fuchs, L. S.; chair) (2021)
review; evidence grade B

Cognitively Guided Instruction cluster RCTs (grades 3-5 efficacy; grades 1-2 replication; 5-year follow-up) - Schoen, R. C.; LaVenia, M.; Tazaz, A. M.; Farina, K.; Dixon, J. K.; Secada, W. G.; Rhoads, C.; Perez; A. L. (FSU Learning Systems Institute; IES-; FLDOE-funded) (2020)
rct; evidence grade B

Which Instructional Practices Most Help First-Grade Students With and Without Mathematics Difficulties? - Morgan, P. L.; Farkas, G.; Maczuga, S. (2015)
longitudinal; evidence grade D

EEF trials of conceptual/realistic reform maths at scale: ICCAMS and Realistic Maths Education - Education Endowment Foundation (independent evaluators) (2021)
rct; evidence grade B

Does Discovery-Based Instruction Enhance Learning? A Meta-Analysis - Alfieri, L.; Brooks, P. J.; Aldrich, N. J.; Tenenbaum, H. R. (2011)
meta-analysis; evidence grade C

When Problem Solving Followed by Instruction Works: Evidence for Productive Failure - Sinha, T.; Kapur, M. (2021)
meta-analysis; evidence grade C

The Effectiveness of Direct Instruction Curricula: A Meta-Analysis of a Half Century of Research - Stockard, J.; Wood, T. W.; Coughlin, C.; Rasplica Khoury, C. (2018)
meta-analysis; evidence grade C