Symptoms of dyscalculia in school-age children: 11 signs and what lies behind them

When it's not just “bad at math”

Many children have difficulties with math — and it's far from always dyscalculia. But there are characteristic signs that point to a systemic disorder rather than a gap in knowledge. R.I. Lalaeva identified 11 such symptoms. Behind each one is a specific mechanism — and identifying it is what determines how to help the child.

11 signs of dyscalculia

1. Doesn't know number bonds

The child doesn't understand that 7 is at the same time 3+4, and 5+2, and 6+1. To them, a number is a label, not a system of relationships. This isn't a gap in memorization — it's that the operation of classification hasn't developed.

2. Has no sense of “more — less”

Can't say which is more — 8 or 5 — without counting. Mechanism: weak instant perception of quantity (subitizing).

3. Always counts from one

To solve 6+3, starts: “one, two, three, four...” — can't enter the number sequence at an arbitrary point. This is a sign that sequential processing hasn't developed.

4. Doesn't know a number's neighbors

Has trouble saying what comes before 7 and after 7. The idea of the number line as a spatial structure is impaired.

5. Gets lost in the number sequence

Skips numbers, changes the order when counting (…5, 6, 8, 7, 9…). Weak sequential processing of information.

6. Doesn't know math words

Confuses “reduce” and “subtract,” “increase … times” and “increase by.” This is a speech disorder that directly affects understanding of word problems.

7. Names numbers incorrectly

Confuses 14 and 40, 16 and 60. This isn't carelessness — the number words sound alike, and with weak phonemic perception, they are hard to tell apart.

8. Confuses digits when writing

Writes 6 instead of 9, 3 instead of 8. An imprecise visual image of the digit — a spatial mechanism, not “bad handwriting.”

9. Counts on fingers — always

Uses fingers even for simple problems by the end of Grade 1. The child is stuck at the first stage of forming the action and can't move on to internal images.

10. Can't memorize the tables

The addition, subtraction, or multiplication table won't stay in memory. This is a consequence of weak memorization — rote repetition doesn't help without work on structure.

11. Thinking is too concrete

Solves problems only with pictures or objects. Abstract numbers without support are out of reach. The child hasn't moved from action to thought.

Why the same symptom calls for different approaches

“Doesn't know the tables” seems like a simple symptom. But behind it may be weak memory, weak sequential processing, or a lack of understanding of the operation of multiplication itself. The approach will be different in each case.

That's exactly why it's important to look not at the mistake but at the mechanism behind it. One child confuses 6×7 and 7×6 because they don't see the connection. Another — because they can't hold two numbers in memory at the same time. A third — because they don't understand that multiplication is repeated addition.

Five types of dyscalculia

L. Košč identified five types of dyscalculia: verbal (the problem is with words), practognostic (with actions on objects), dyslexic (with reading symbols), graphical (with writing), and operational (with calculations). Most children have a combination of several types — which is why assessment has to be comprehensive.

What a parent can do

If you recognized your child in this list, it's not a verdict but a map. It shows where to look for the cause and in which direction to work. The next step is to identify the leading mechanism (on your own or with a specialist's help) and choose exercises that work on exactly that mechanism.