The purpose of this paper is to clarify the use of statistical investigations in social studies and science textbooks and to consider how to teach statistics using cross-curriculum activities in primary education. Textbook analysis was used to determine the types of activities covered in each discipline. In both social studies and science, social and natural events were explored statistically, however, these activities were not taught explicitly as statistical investigations. In contrast, in elementary mathematics, statistical knowledge was taught as a component of the curriculum but application of this knowledge in statistical investigations was not explicitly covered in the textbook. Finally, considering the importance of STEM education, a method of associating these disciplines centered on statistical investigations was considered.