Dyscalculia is one of the barriers to learning for students with some special mental retardation needs. Students with intellectual disabilities may also have dyscalculia. In that sense, in learning mathematics, it is necessary to use various learning media. Related to this condition, the present study aims to determine the effect of the use of instructional video media to introduce natural numbers to students who experience mental retardation with dyscalculia. This type of research is an experimental research design with a single subject. This single-subject research uses the A -B method. The research subjects were chosen based on a purposive sampling technique because the researchers had to find subjects with mental retardation as well as dyscalculia characteristics with these characteristics one elementary special school in Yogyakarta was found. Data collection techniques involved using the method of observation, interviews to determine the characteristics of the subject, tests to determine the ability of subjects to recognize natural numbers. The results of this study indicate that interactive media positively influences the ability to recognize natural numbers in mentally retarded children with dyscalculia. This can be seen from the average score obtained by the subjects before being given an intervention that is 30 and increased to 54 after being given an intervention.

<p>The purposes underlying this study are (1) to describe an English textbook entitled “Passport to the World 1” in general; (2) to analyze the quality of the English textbook in developing communicative tasks and types of communicative materials. This research used a descriptive method. The data source of this research is the textbook for seventh grade of Junior High School, published in 2009 by PT Tiga Serangkai Pustaka Mandiri. In collecting data, this study takes four of ten units in the textbook randomly. The study uses theory of Cunningsworth (1995) to analyze the textbook in general and Communicative Language Teaching principles to analyze the tasks and material of the textbook. The result of the study shows that (1) the description of the textbook in general is fairly good (62.5 %); (2) the quality of communicative tasks is good (68.7%), and the quality of types of material in CLT is very good (75.03%). The textbook has all criteria of communicative tasks and materials, but each unit of the the textbook is still not complete. It means that the textbook is appropriate to be used and it  will be better if the teacher also completes each unit which is not appropriate communicative criteria by using other sources in order to develop students’ communicative competence.</p>