This study aims to determine the vowels and consonants of mentally retarded children capable of light level V grade students at SDLB PK & PLK Galesong when speaking. The subjects of this study were 16 mentally retarded students who were in SDLB PK & PLK Galesong but the object was grade V students at SDLB PK & PLK Galesong mentally retarded, amounting to 5 people. The method in this research is the descriptive method. The instruments used were observation, recording, and taking notes. then to find out the results of the mental retardation ability of children is used a suitable checklist or checklist in the form of indicators of the speech ability of mentally retarded children. The results showed that the acquisition of data known a number of students with data 001 amounted to 50, 002 amounted to 63, 003 amounted to 53, 004 amounted to 43 while Data 005 got a value of 30, thus the results of the average speech ability of mentally retarded students capable of light level students in SDLB Galesong PK & PLK of 48. From that, it can be concluded that mentally retarded students capable of a mild level of education are in the category lacking in speaking ability because of the many phonemes and phonemes both vocal and consonant changes.
                        
                        
                        
                        
                            
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