Padang Brahrang is a village located in the city of Binjai, Langkat Regency, which has many stories ranging from the cleanliness of the village, which has greenery and cultivation of plants ranging from flowers to vegetables. But in this case, we students of North Sumatra State Islamic University are doing Community Service activities in Padang Brahrang village, one of the activities we do is making natural pesticides from papaya leaves that are useful for keeping plants or plants from pests and diseases.  . The type of research used in this paper uses qualitative research methods with descriptive approaches. Pesticide manufacturing greatly influenced the development of plants and plants in the village, resulting in the production of pesticides given to the mother and father of village devices that cultivated plants and nearby communities.

This research aims to create an instrument to measure critical thinking skills in algebra material for students at SMP N 1 Percut Sei Tuan, especially for class VII students. The research was carried out on October 24 2023 using the R&D (research and development) approach and the Borg & Gall model which has 10 stages, namely: data collection, planning, product draft development, design validation and revision, product refinement resulting from field trials, field trials ( large groups), product refinement, and implementation. This research produced a reliability value of 0.702 with 60 respondents and 5 questions, which states that the 5 questions were reliable. By carrying out this research, it is possible to determine students' critical thinking abilities and at the same time improve the critical thinking abilities of students at SMP N 1 Percut Sei Tuan..