01 Jul Dyscalculia and the Myth of Being Bad at Maths
Dyscalculia and the Myth of Being Bad at Maths
By a mathematics teacher (Maths & Further Pure) working with our Global Educational Achievement programme
In twenty years at the front of mathematics classrooms, I have never met a child who was bad at maths. I have met children with dyscalculia. I have met children whose working memory could not hold four steps at once, children whose times tables dissolved overnight no matter how many hours they drilled, and children so anxious that the sight of a worksheet closed their thinking down entirely. What I have never met is a child for whom “bad at maths” was the actual explanation.
Yet it is the explanation our culture reaches for first. Stand at a parents’ evening and you will hear adults say “I was never a maths person” with a cheerfulness nobody would ever apply to reading. No parent announces they were never really a reading person. That social permission has a cost: reading difficulties earn a referral, while maths difficulties too often earn a shrug and an inherited identity. Some of the children hiding behind that shrug have a genuine, specific and supportable learning difference.
Key Takeaway
Dyscalculia is a specific learning difference in mathematics, roughly as common as dyslexia but identified far less often, partly because “bad at maths” is culturally acceptable in a way “bad at reading” never is. A teacher can see that a child is struggling, not why. A psychoeducational assessment separates number sense, working memory, retrieval, speed and anxiety, unlocking targeted teaching, exam access arrangements and a kinder self-story.
What dyscalculia actually is
Dyscalculia is a neurodevelopmental difference in the way the brain processes numbers and mathematical information. In formal terms it sits within the DSM-5-TR as a specific learning disorder with impairment in mathematics, and it says nothing whatsoever about intelligence or effort. Most estimates put it at around one child in every classroom, roughly as common as dyslexia, yet it is identified only a fraction as often. Dyslexia has had decades of advocacy and awareness campaigns. Dyscalculia is still routinely misfiled under personality.
What I see from the front of the room
Finger counting that persists deep into secondary school. Number facts practised all weekend and gone by Tuesday. Place value that wobbles, so 105 becomes 1005 on the page. Symbols that swap meanings mid-exercise. Clocks, elapsed time and timetables treated as hostile territory. And, most telling of all, no feel for magnitude: an answer ten times too large raises no alarm, because estimation, the quiet sense of what a number should roughly be, never developed.
Around the edges you see the secondary layer, which is usually what teachers notice first. The forgotten book. The stomach ache on test day. The class clown routine timed precisely for the mental maths starter. Maths anxiety is real and it is corrosive, but in many children it is the smoke, not the fire.
The boy who built cities
A few years ago a mother sat across from me at a parents’ evening and cried. Her son built elaborate Lego cities, beat the adults in the family at strategy games, and had decided, somewhere around age seven, that he was stupid. Nobody had said the word to him. The timed tables tests had said it for them, week after week, in red pen.
What struck me about that boy was not the difficulty. It was the contradiction. Spatial reasoning and strategic thinking that were clearly strong, sitting right beside fact retrieval that simply would not automate. That is not an inability. That is a profile. And profiles can be mapped.
What I cannot see from the whiteboard
Here is the honest limit of my job. Put five students in front of me with the same wrong answers on the same worksheet, and there may be five different reasons underneath. One has a core difficulty with number sense itself. One has a working memory bottleneck and loses step two while performing step three. One cannot retrieve facts at speed but reasons beautifully when the clock is removed. One has an attention difference and never fully registered the question. One understood everything and was too anxious to show it.
From the front of the room, I can see that a child is struggling. I cannot reliably see why. A psychoeducational assessment can. It measures number skills alongside working memory, processing speed, reasoning and attention, and it separates the strands that classroom observation blurs together.
When that boy was assessed by Global Education Testing, the report confirmed what the Lego cities had been suggesting all along: strong reasoning, a specific and identifiable difficulty, and a set of recommendations his teachers could act on the following Monday. Just as important, the word dyscalculia lifted the moral weight off him.
He was not lazy. He was not dim. His brain handled numbers differently, and now everyone, including him, knew how. Two years later he chose the harder maths option himself.
What works in the classroom
Once you know what you are working with, the teaching follows. These approaches help almost every student, and for learners with dyscalculia they are not enrichment, they are the road itself.
- Concrete before abstract. Counters, blocks and number lines first, symbols second. Understanding built with the hands holds better than understanding imposed on the page.
- Make the maths visible. Diagrams, bar models and colour-coded steps, with the key information in a word problem highlighted so the question stops hiding inside the sentences.
- One step at a time. Worked examples and explicit sequences protect working memory. A child who can hold one step can climb a staircase; nobody can climb a wall.
- Say it, hear it, move it. Verbalising the method, chants for facts, games and movement. Multiple routes into memory mean the learning survives the weekend.
- Anchor it in real life. Money, cooking, sport statistics, journey times. Relevance recruits motivation, and motivation buys the repetitions that fluency needs.
- Let technology carry what it should. A calculator or maths app, used deliberately, stops fact retrieval from gatekeeping reasoning. We are teaching mathematics, not memory.
Exams measure the wrong thing unless we fix it
A timed maths paper is, for a dyscalculic student, substantially a test of retrieval speed under pressure, which is precisely their area of difficulty. Examination access arrangements exist to correct that: extra time, rest breaks, and the calculator or formula provisions each board allows. With those in place, the exam goes back to measuring mathematical reasoning, which is what it was always supposed to measure.
But access arrangements rest on evidence, and the evidence comes from assessment. That report is not paperwork. It is the key that changes what the exam is testing.
Nobody is just bad at maths
Every child I have taught with dyscalculia had load-bearing strengths somewhere: spatial, verbal, strategic, creative. The work is building a bridge from what they can do to what they cannot do yet, and the bridge starts from an accurate map of both sides.
In twenty years I have taught many children who believed they were bad at maths. I have never taught one who was right.
Alexander Bentley-Sutherland is the CEO of Global Education Testing, the leading provider of Learning Development Testing tailored specifically for the International and Private School community worldwide.