<![CDATA[Mathematics is anvimportant science for life. Also besides, mathematics is the basis for other sciences, so it is important to master mathematical understanding and disposition skills. Through the project-based learning model, the teacher optimizes learning to improve mathematical understanding and disposition. This study aims to determine the increase in mathematical understanding and disposition through project-based learning models and conventional models and to find out the positive relationship between mathematical understanding andidisposition ability. This study used a quasi-experimental method with the design of the nonequivalent control group design. The population in this study were all fourth-grade students in Cicalengka District, with a sample of fourth-grade students at SDN Leuwiliang (experiment), and SDN Dampit 01 (control). Conclusions from this study are, 1) Project-based learning models and conventional models can improve mathematical understanding and disposition skills, 2) Project-based learning models are better at improving mathematical understanding and disposition than conventional models, 3) There is a positive relationship between the ability of understanding and mathematical disposition.Project-based Learning Model, Mathematical Understanding Ability, Mathematical Disposition.]]>
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