The development of learning instruments using the creative problem-solving learning model to improve students’ creative thinking skills in mathematics

Students should have creative thinking skill in solving mathematics problems by using various alternatives solutions. Unfortunately, many students still have poor quality in creative thinking skill because they have less attention to develop their ability when learning mathematics. One of the efforts to improve students' creative thinking skills is by applying creative problem solving (CPS) learning model. This research aimed to develop the valid and effective CPS learning instruments to improve the students' creative thinking skill by using the development method used a 4D model. There are four stages in the 4D model, including defining, designing, developing and disseminating. However, this research only involved the first three stages. The learning instruments developed were lesson plan, worksheet, and test that covered creative thinking skills. Four validators validated these instruments. The findings showed that all instruments were in a highly valid category, with an average score of 4.1, 4.4, and 4.2 respectively and can be used with minor revisions. Furthermore, the test of creative thinking skills was also classified into the highly valid category with an average score of 4.2 and was ready to be used minor revision.