The researchis quasi experiment research. The researsch aims to determine the effect of guided discovery learning method to mathematical problem solving ability. Population in this study were SMP Swasta 2 TAMORA, and the sampel is IX-1 class students. The instrument in the research is the test of mathematical probling solving ability. The result of the research were analyzed by correlation test is 0,701. And thitung 4,610 > ttabel 2,07, so there is the significant influence between guided discovery learning on students’ mathematical problem solving ability. Keywords : Guided Discovery Learning, Mathematical Problem Solving Ability
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