The purpose of this quantitative comparative research was to determine if there was a statistically significant main effect of teaching method (project-based vs traditional) on second-grade students' learning in mathematics and if gender differences exist between the scores of male and female students in general and the scores of male and female…

In this paper, we present a study of second graders' learning about the nature of matter in the context of content-rich, model-based inquiry instruction. The goal of instruction was to help students learn to use simple particle models to explain states of matter and phase changes. We examined changes in students' ideas about matter, the coherence…