There is a very large literature on young children's informal mathematics during the past thirty years. But most of this information comes from laboratory experimental studies. From the perspective of Vrgotsky and Brofenbrenner, it is important to assess the informal mathematics that occurs during the course of young children's everyday activities. The purpose of this review is to compare the methods and results researchers used to collect young children's informal mathematical experiences. This review begins with the theoretical perspectives on researching everyday mathematical experiences. In the next section, the methods used to collect young children's everyday mathematical experiences are reviewed. This article ends with the comparison of these methods and results, and some conclusions and suggestions are suggested.