Perhaps the vast majority of students with disabilities need support with math. Their challenges with math can be directly related to their disability or can be the result the effects of an ongoing struggle with math. The later results in what is termed secondary characteristics.
When I work with students with a disability, I first seek out background information about the student to identify what interests them, what reinforcers (rewards) can be used to enhance their performance, and what challenges and behaviors need to be addressed. Upon gather this information, I often decide to use a token sheet that is personalized for each student.
Below is an image of such a token sheet. At the start of our work together I felt the student in question needed immediate reinforcement for work completed to get him into a groove. I was also targeting a behavior in which he would draw dots on each digit he wrote, which slowed him down considerably. He would earn a Scooby (I would circle it) in the middle column for completing his work and an extra Scooby in the right column if he wrote digits appropriately (no dots). After 2 sessions, his dot writing dropped significantly to the point that I was able to remove the column on the right. As you can see at the bottom, 5 Scoobies resulted in iPad time.
This can be particularly effective for students who have more severe math anxiety, a fear of failure, or have ADHD. Such a token sheet can be included in the accommodations page of the IEP.