Transition period from preschool years to school years is a time of rapid changes in children’s development. Children with intellectual disability lag behind their peers without disabilities in their school readiness skills, especially in math skills. Thus, there is a great importance of school preparation programs for children with intellectual disability in improving their math abilities. The aim of the present research was to compare the effectiveness of two preschool programs in improving math abilities of children prior to their enrollment in elementary schools. The sample for this research comprised 90 children aged 60-72 months. Of those, there were 60 children with intellectual disability and 30 typically developing children. Math abilities were assessed with a subscale from Peabody Individual Achievement Test. The results of this research indicated that children with intellectual disability attending special education preschool program achieved significantly better math results than children with intellectual disability attending inclusive preschool program. Some suggestions to preschool teachers on how to improve the effectiveness of their work with children with intellectual disability were given.