Dyscalculia

What Is Dyscalculia?

Dyscalculia is a specific learning difficulty (SpLD) that affects the way a person understands and works with numbers. In March 2025, the SpLD Assessment Standards Committee (SASC) published updated guidance with the following definition:

SASC 2025 Definition: Dyscalculia is a specific and persistent difficulty in understanding numbers which can lead to a diverse range of difficulties with mathematics. It will be unexpected in relation to age, level of education and experience and occurs across all ages and abilities.

Dyscalculia is neurological in origin and is a lifelong condition. It affects an estimated 5 to 7 per cent of the population. It is important to understand that dyscalculia is not the result of poor teaching, lack of effort or low intelligence.

Dyscalculia frequently co-occurs with other specific learning difficulties, particularly dyslexia. Pupils may also experience associated difficulties with working memory, sequencing and spatial reasoning.

Maths Difficulties vs. Dyscalculia

It is important to distinguish between general maths difficulties and dyscalculia. Many pupils find mathematics challenging for a variety of reasons, including gaps in teaching, missed schooling, maths anxiety or difficulties with the language of maths.

Dyscalculia is different because it involves a specific difficulty with understanding number itself. A pupil with dyscalculia may struggle to grasp the quantity that a number represents, to understand how numbers relate to each other and to develop an intuitive sense of number (sometimes called "number sense").

General maths difficulties often respond well to additional teaching and practice. Dyscalculia, by contrast, is persistent and requires more specialised, structured intervention that builds understanding of number from the foundations upward.

How Dyscalculia May Present in the Classroom

Dyscalculia affects each pupil differently, but common indicators include:

Difficulty understanding the size or value of numbers, for example not recognising that 8 is larger than 5 without counting
Reliance on counting on fingers long after peers have moved to more efficient strategies
Difficulty learning and retaining number facts such as times tables, despite repeated practice
Confusion with mathematical symbols and operations (for example, mixing up addition and multiplication)
Problems with place value and understanding what each digit represents in a multi-digit number
Difficulty telling the time on an analogue clock, handling money or estimating quantities
Struggling with sequencing, including counting backwards, ordering numbers and following multi-step calculations
Inconsistency in mathematical performance from day to day
High levels of anxiety around maths lessons and assessments

Strategies for Teachers

Effective support for pupils with dyscalculia draws on the concrete, pictorial, abstract (CPA) approach, which builds understanding systematically.

Building Number Sense

Begin with concrete manipulatives (such as Cuisenaire rods, Numicon, base-ten blocks and counters) to develop a tangible understanding of number and quantity
Progress to pictorial representations (bar models, number lines, dot patterns) before introducing abstract symbols and notation
Use structured number talks and estimation activities to develop intuitive number sense
Teach place value explicitly using physical resources before moving to written methods

Teaching and Assessment

Break mathematical processes into small, explicit steps and teach each step individually
Allow additional time for processing and completion of work
Keep worksheets and resources visually uncluttered, with plenty of space for working out
Provide reference tools such as number squares, multiplication grids and worked examples that the pupil can use independently
Use real-life contexts wherever possible, including money, measurement and everyday problem-solving
Focus assessment on understanding and reasoning rather than speed of recall

Reducing Anxiety

Avoid putting pupils on the spot with rapid-fire mental maths questions
Create a classroom culture where mistakes are valued as part of learning
Praise effort, strategy use and reasoning rather than speed or correct answers alone
Allow the use of calculators for tasks where the learning objective is not calculation itself

How Teaching Assistants Can Help

Teaching assistants can make a significant difference for pupils with dyscalculia. The focus should be on developing understanding and building independence.

Pre-teach key concepts and vocabulary before the main lesson so the pupil arrives prepared
Work alongside the pupil using concrete manipulatives, modelling how to use resources and then gradually stepping back
Read word problems aloud so the pupil can focus on the mathematics rather than the reading demands
Break multi-step problems into individual steps and support the pupil in tackling each one
Help the pupil create personal reference sheets with key facts and methods they can use independently
Encourage the pupil to explain their thinking aloud, as verbalising mathematical reasoning strengthens understanding
Provide over-learning opportunities through short, focused practice sessions rather than lengthy repetitive worksheets
Support the development of self-checking strategies so the pupil can review their own work