CASE STUDY OF MEDIUM LEVELS OF CHILDREN OF MIDDLE LEVELS OF SMPKH YDKW 01 TANGERANG CLASS VII ACADEMIC YEAR 2020/2021 IN ADMINISTRATION AND REDUCTION OPERATIONS WITH BRUNER THEORY
Without us realizing that mathematics is not spared in our daily lives, without mathematics everyone will find it difficult to live life. This study aims to find out how to add and subtract moderately mentally retarded children based on symbols. The type of research carried out by the researcher is qualitative with the case study method, so that the research subjects are 4 mentally retarded children who are in class VII SMPK YDKW 01 Tangerang. The results of the study are in the form of a description that describes how to add and subtract operations with symbols in Bruner's theory, from the results of research in the field, children with moderate mental retardation do not meet the minimum completeness criteria, only 25% are able to meet the minimum completeness criteria.