Learning mathematics is meaningful when students can connect mathematical ideas, connecting mathematics to other disciplines, and connecting mathematics with everyday life, so that students can develop the skills. This quasi-experimental study aimed to determine. whether the mathematical problem-solving ability of students who get a Instruction problem based learning model better than students who received conventional learning models. The sample population in this study were 16 high school students Garut. These results indicate. that: ( 1 ) mathematical problem-solving ability of students who get a Instruction problem. based learning model better than students who received conventional learning models; ( 2 ) an increase in mathematical problem-solving ability of students who have learning model of Problem Based Instruction high category; ( 3 ) students' attitudes toward learning model of Problem Based Instruction in general showed a positive attitude.
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