It is a common misconception that children on the autism spectrum find mathematics easy. In fact the opposite is true for some, and exposure to basic mathematics in the early years can be crucial in establishing the foundations for understanding later in life. This book provides practical strategies and tools for teaching key mathematics concepts to children with an autism spectrum disorder and other developmental delays. The authors emphasise the importance of incorporating a child's special interest into learning in order to help them engage fully with new concepts. Topics covered include colours, shapes, categories, numerals, sequencing, addition and subtraction and using money, and the book includes worksheets and activities for incorporating mathematics into daily living skills. This is an essential resource for teachers, teaching assistants and parents who wish to develop mathematics skills in children with an autism spectrum disorder and other developmental delays.