I also have quite a few students in my class who have ADHD. However these kids are in third grade and are in a self contatined classroom, so all subjects are taught. What works best for my students is that I always chunk their work. Meaning that if we were doing something that had 20 problems, then I would divide their work into two sections- 10 problems each. This would allow the student to take it step at a time and not overwhelm them with the amount of work they have. Additionally, I have noticed that they get stressed out very easily. So when this occurs, I let them have a brain break or take some energy out. I hope these little techniques help a bit!