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This study to describe student-s mathemaical thinking aspect mathematization that measured by design result of problem – solving questions in topic arithmetic operations form algebra. The indicators of measuring mathematical thinking aspect mathematization are formalization, connecting, geometrization, and optimization. The subjects in this study were three students in grade 7 who were taken randomly. The research methods of this study consist preliminary design, focus group discussions (FGD), trials, observation and interview, and retrospective analysis. These 3 questions given can bring about mathematical thinking aspect mathematization. . The technique for data analysis was qualitative. As the results of this study, for question number 1, all of student-s answer was correct, student 1 showed appearance of geometrization, formalization, and optimization student 2 and 3 showed appearance of geometrization and formalization. For question number 2, all of student-s answer was correct, but on the number questions the third student was confesed when drawing and they discussed with a long enough time and finally they got the right picture all students showed appearance of geometrization, formalization and optimization . For question number 3, all of student-s answer correct, all students showed appearance of geometrization and formalization. all of student showed appearance of formalization, geometrization, and optimization, but they don-t connecting.