This research presents the way in which photography can affect the estimated capacity of length measurements in a group of tenth grade students of the Tesoro de la Cumbre School, using it as a learing tool. The investigation is structured in five chapters. In general, chapters one and two include the research problem and the theoretical framework, while chapter three describes the methodology used; in chapter four the data is analyzed and results are extracted, to end with chapter five where conclusions of the research, contributions and recommendations are presented. The development of this research demonstrated that photography as a learning tool of estimation constitutes a training field for the management of concepts and skills related to the magnitude and its measurement (perception and comparison), at the same time as it constitutes a field of work that allows to detect basic conceptual and procedural deficiencies (conversion of measures, recognition of the international system, estimation in calculation) coinciding in the ideas of those researchers who see estimation as a useful tool for the teaching of other concepts (Bright, 1976; Segovia et al., 1989; Whitin, 2004).

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