If measurements are to be treated as data, it is necessary to understand what it means to measure. In this study, we analyzed the structure of textbooks for deepening the understanding of measurements, using textbooks of arithmetic, mathematics, and science. Through the analysis, we identified problems, in the structure of textbooks, that hinder the understanding of measurements.
References to units as relevant words were only present in arithmetic and mathematics. In contrast, when elementary and junior high school science textbooks were included, the clues to understanding that measurement is possible were found in math and arithmetic textbooks. To improve this situation, it is necessary to demonstrate that measurement is possible, and that the measurement values are related in the mathematics department of junior high school.