The purpose of this research is to analyze the feasibility and validity of problem-based learning worksheets assisted by liveworksheets. This development research was carried out using the 4D method which includes the Define, Design, and Development stages. In the analysis stage of the feasibility and validity test data, questionnaires and documentation were collected. The feasibility of teaching materials was analyzed based on the results of expert validation and the practicality of teaching materials based on the results of students' answers. The results of this study indicate that the tested LKPD is feasible and valid as learning material for students. Expert validation results produce an average score of 89.8% with a very valid category, it can be said that it is feasible to use in the field. The results of the student response questionnaire analysis showed that LKPD was considered practical by students with a percentage of 75% in the limited trial while 82% in the broad trial with the very practical category. This can show that the problem-based learning worksheet on social arithmetic material assisted by the liveworksheet is very good for use during the mathematics learning process
