One of the fundamental topics in mathematics taught in third grade of elementary school is whole numbers, which serve as an essential foundation for understanding counting concepts, arithmetic operations, and solving everyday problems. This study aims to describe the application of cognitive learning theory in the teaching process of whole numbers in the third grade of SD Negeri 004 Long Kali. The research uses a qualitative approach with respondents consisting of teachers, students, and the school principal. Respondents were selected using purposive sampling based on the research objectives. Snowball sampling occurred through the involvement of participants in line with the selected respondents. The research procedure began with the researcher designing instruments and learning tools based on the application of cognitive learning theory in the teaching of whole numbers, and the research was conducted using interviews and observations. Data analysis was carried out by drawing preliminary and final conclusions throughout the interview process. The research findings show that the teacher respondent had prepared, implemented, and evaluated student engagement and understanding by applying cognitive learning theory in the teaching process of whole numbers. Student respondents had prepared for, participated in, and completed group assignments, and the principal respondent had facilitated the preparation, implementation, and evaluation stages.
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