This 5E (Engage, Explore, Explain, Elaborate, and Evaluate) learning cycle integrating science and mathematics challenges and engages second-grade students in designing sail cars to solve an engineering problem. Students create and use line plots to organize their data to evaluate the strengths and weakness of their design solutions. Three strategies were used to plan for successful integration in a 5E learning cycle. Integrating the science, technology, engineering and mathematics (STEM) fields can increase student interest and learning (Becker and Park 2011), and the authors' experiences with this integrated project support this finding. The integrated learning activities and assessments presented in this article are the result of collaboration between elementary classroom teachers, preservice teachers, and higher education faculty, but the strategies used could be implemented by anyone seeking to integrate math and science in an elementary classroom.