We often talk about ADHD as if it affects a child’s academic performance equally. That is not always the case. Research on how ADHD affects reading, writing, and math tells a more specific story: different subjects draw on different cognitive skills, and ADHD affects each of those skills to different degrees.
Working memory sits at the center of most of these differences. Which academic skills lean hardest on working memory, and which don’t, explains a lot about why a student can genuinely struggle in one subject while doing fine in another.
What is Working Memory and How is it Linked to ADHD?
Working memory is the ability to hold information in mind and actively use it over a short period. It is necessary for a wide range of academic tasks, such as:
- Following multi-step instructions
- Taking notes while also listening
- Remembering the beginning of a sentence while reading toward its end
We note often that ADHD is completely unrelated to intelligence. People with ADHD span the same spectrum as anyone else, from below average to gifted. Instead, research consistently links working memory deficits to academic underachievement in ADHD, and the specific component of working memory most implicated, the central executive, predicts performance across both math and reading.
That shared foundation explains why ADHD rarely shows up as a struggle with just one subject, though the degree varies by subject, since some academic tasks demand far more from working memory, moment to moment, than others do.
Math
Math places some of the heaviest demands on working memory of any academic subject. Multi-step problems require holding an intermediate result in mind while performing the next operation, tracking where in a sequence a problem currently stands, and remembering which operation comes next, all at once. Research has found working memory deficits specifically predict math performance in children with ADHD, and one large study found that hyperactivity and impulsivity symptoms predicted math performance directly, a more direct link than researchers found for reading or spelling.
Processing speed can also affect math results, though this may differ between child. The same research found that slower processing speed helps explain the connection between inattention and math difficulty specifically, since math problems often come with implicit time pressure, whether that’s a timed worksheet or simply keeping pace with a lesson moving to the next step. Word problems compound this further, layering reading comprehension demands directly on top of the math itself.
Reading and Writing
Reading and writing show a more specific pattern than a blanket comprehension or literacy problem. A large study comparing over 500 children with ADHD to children without it found that ADHD independently predicted difficulty with writing composition and reading comprehension. These were two of the more complex, advanced skills in each area, even after accounting for basic skills like word recognition and spelling.
A student with ADHD might decode words accurately and spell reasonably well, while still losing track of a passage’s meaning partway through, or struggling to organize a paragraph into a coherent argument. Sustained attention across a long passage, and the executive function required to plan and structure writing, are the specific skills under strain. More basic skills, like reading ability and spelling, are less affected.
Science and Other Multi-Step Subjects
Some form of science combine several of these demands at once, though it depends on the approach to science. Lab procedures require following a specific sequence of steps accurately, often under time pressure.
Note-taking during a lecture draws on the same working memory needed for math, holding what a teacher just said in mind while writing it down and listening for what comes next. Longer-term projects, a research paper or a multi-week experiment, require the same planning and organizational skills implicated in writing composition, stretched out over a much longer timeline.
The underlying mechanism is consistent even where subject-specific research is thinner: tasks with more steps, more sequencing, and more sustained organization ask more of working memory and executive function, and that’s where ADHD tends to create the most friction.
Individual Differences Between Children
It should be noted, however, that children with ADHD are more capable of sustained attention when the topic is something that truly interests them. As such, a child with a strong interest in math or science, for example, may be able to sustain attention needed to complete these subjects.
If a child seems to thrive in math, science, or reading, but is not doing well in other subjects, they may still have ADHD but may find that they simply have a strong interest in the topic.
What This Means for Support
Knowing which specific skills are under strain changes what kind of support helps. A student struggling with math word problems needs something different than a student who can solve equations but loses focus reading a science textbook chapter. Generic study skills advice tends to miss this distinction, treating academic struggle as one problem with one fix.
Executive function coaching works directly with the specific skills, working memory support, planning, organization, sustained attention, that show up differently across math, reading, writing, and science, rather than applying the same approach regardless of which subject is causing the trouble.
If a specific subject has become a consistent source of struggle, that pattern is usually telling you something specific about which skills need support. Call (516) 873-8056 to talk through what’s happening for your child in the subjects giving them the most trouble.