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Abstract This research is based on the lack of students' ability to answer the Higher Order Thinking Skills (HOTS) questions. This is shown from the survey results of TIMSS in 2015 which stated that Indonesia ranked 45 of 50 countries. Furthermore, the survey results of the PISA in 2015 showed that Indonesia's mathematical competence was 386 points of 600 points with a rating of 64 from 72 countries, therefore, to improving HOTS a Problem Based Learning model is needed (Rahmawati, 2016). The purpose of this study is to describe the process and results of the development of learning equipment used Problem Based Learning model in sequences and series material to improve HOTS of senior high school students. The type of this research is developmental research that uses the Plomp’s Development model which consists of preliminary investigation phase, design phase, realization phase, and test, evaluation and revision phase. The research instrument used was a learning equipment validation sheet, an observation sheet of learning implementation, an assessment sheet, and a student questionnaire response sheet. This learning tools was tested to 32 students of XI MIPA-3 class at SMAN 1 Sidoarjo. The results of these development equipment are categorized very well (which is shown by the an average value of 4.30 for lesson plan, 4.28 for student’s worksheet, 4.25 for assessment sheet range from 5.00), practical (which is shown by the average rating of the validator is a little revision and the implementation of learning in the excellent category with an average of 3.71), and effective (classical succeed is reached, Learning Outcome II is higher than Learning Outcome I, and student scores on HOTS questions number 1 on Test II is higher than score number 1(b) on Test I, and student response is positive). So, the learning equipment used Problem Based Learning model in sequences and series can improve HOTS of Senior High School students. Keywords: Problem Based Learning, Higher Order Thinking Skills

THE DEVELOPMENT OF LEARNING EQUIPMENT USED PBL IN SEQUENCE AND SERIES TO IMPROVE STUDENT’S HOTS