Abstract
As part of the Early Numeracy Research Project, children's mathematical growth in 295
single grade and 275 combination classes in grades P - 2 was compared. Significant
differences were found with negative effects for students in the upper grades of combination
classes, though overall differences were not significant. Data also indicates that deliberate
assignment of weaker students to the upper grade of a combination class as an exercise in
homogeneity can have a negative effect on mathematical growth.