Abstract
This study aims to determine (1) validity of mathematics’ worksheets based on problem-solving at the numbers topics; (2) the effectiveness of learning by using mathematics’ worksheets based on problem-solving at the numbers topics. This research was development research with a development model of Dick and Carrey. The subjects of this study are the class VII-B students of Junior High School of Nusantara Lubuk Pakam in the Academic Year of 2018/2019. While the object of this research is a mathematics’ worksheets based problem-solving at the numbers topics. The results of the study stated that (1) mathematics’ worksheets were valid with an average score of 3.95, and (2) learning by using mathematics’ worksheets was effective. The effectiveness of learning by using mathematics’ worksheets is analyzed based on student activity, skills of the teacher to manage learning and students’ problem-solving ability. The average score of student activity was 3.81, the skills of the teacher manage to learn was 4.27, and the percentage average of the problem-solving skills of students was 79.75.
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