The purpose of this action research is to describe the effects of the application of daily growth mindset lessons upon the accuracy and level of work completion in math assessments. Participants included the researcher’s class of 13 third grade students from a small rural Midwest school district. Students participated in a daily growth mindset lesson intervention for a period of 4 weeks. Data was collected using math assessments and growth mindset surveys. The results concluded that although students can develop an improvement in mindset with intervention, it does not always directly correlate to the improvement of math accuracy and work completion.