Mann Whitney test sig value (2-tailed) 0.00. This means that the GRASPS-based PjBL model significantly improves junior high school students' skills in solving mathematical problems. The integrated learning process involving projects allows students to relate mathematical concepts to real situations, strengthen their understanding of the topics studied, and develop problem-solving and collaboration skills. In conclusion, the improvement of mathematical problem solving skills of VIII grade students whose learning uses the GRASPS-based PjBL model is better than those who use ordinary learning. The implication of this research is the importance of developing learning strategies that encourage active student involvement, linking learning with real contexts, such as problem solving and collaboration in the context of mathematics education.
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