This study aims to develop a learning tool for mathematics based on Realistic Mathematics Education on the volume of block and cube material for grade V of elementary schools and to determine their effect on spatial abilities. Spatial abilities need to be improved since elementary school because spatial abilities are related to students’ cognitive abilities. However, student experience problem in learning about space figures, beside the material is abstract, the learning process in the classroom can also affect it. Mix Method is a method used in this research with a Sequential Exploratory design, a method that combines the Thiagarajan model development and sequential quantitative method. Before the data is analyzed, first the variance homogeneity test and normality test are carried out. The first test results indicate that the data is distributed normally. So that the data were analyzed using t-test analysis. The results showed that: (1) the learning device met the criteria of being valid, effective and practical, meaning that the device was proven to be a guide for teachers to improve spatial abilities, (2) a value of significance of 0.000 (p <0.05), indicating that there is a substantial effect on the application of learning used on students’ spatial abilities.
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Nuryami et al. (2021) studied this question.
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