This study examined the relative effectiveness of four widely-used early elementary school math curricula: (1) Investigations in Number, Data and Space (Investigations), (2) Math Expressions (ME), (3) Saxon Math (Saxon), and (4) Scott Foresman-Addison Wesley Mathematics (SFAW).
First graders attending schools assigned to the ME and Saxon curricula scored significantly higher on math assessments than students attending schools assigned to the Investigations or SFAW curricula. Math achievement did not differ significantly between schools using ME and Saxon; nor were there significant differences in student math achievement between schools using Investigations and SFAW.
Agodini, R., Harris, B., Atkins-Burnett, S., Heaviside, S., Novak, T., & Murphy, R. (2009). Achievement effects of four elementary school math curricula: Findings from first graders in 39 schools (NCEE 2009-4052). Washington, DC: National Center for Education Evaluation and Regional Assistance, Institute of Education Sciences, U.S. Department of Education.