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The research aimed to develop the steps of MITRA learning model of problem solving-based to solve mathematical problems in elementary school, to know the product’s validity level of MITRA learning model of problem solving-based according to expert’s validation, and to assure the effective level of MITRA learning model of problem solving-based. The research type was Research and Development (RD (2) product’s validity level of MITRA learning model of problem solving-based according to expert’s validation was 3,75 (75%) on high category, and the media expert was 214 (76,5%) on high category; and (3) product’s effectiveness was on very effective category for students of grade 4 elementary school reaching 97%, and the result was significantly higher than pretest (60%).

Developing of MITRA learning model of problem solving-based to solve mathematical problems in elementary school