This research aims to develop a learning model that can accommodate mathematics learning in basic counting concept for students with intellectual disabilities. Mentally disabled students are students who have below average intellectual intelligence. The teacher needs to modify learning methods to suits the need of the students. The research method used here was an exploratory mixed-method research design. This research developed a school-based collaborative learning model in learning mathematics to improve numeracy skills for mentally disabled students. The construct of a collaborative learning model was developed from data from a qualitative case study on the problems of mathematics learning found in the field. The pre-experiment increases quantitative data about the effectiveness of school-based collaborative learning models. The results presented that there was an increase in mathematics learning outcomes for mentally disabled students in the learning of basic counting. In the first session, the students get 50% of the overall test, and in the next session, there was a very significant increase to 80% of the overall test. The recommendations from this study obtained data that collaborative learning models can improve the mathematical abilities of mentally disabled students.
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