There is a moment most parents recognise. Your child brings home a maths test, the mark is lower than last time, and when you ask what happened they shrug and say they just do not get it. Not one topic. Maths, generally. That shrug is the thing worth paying attention to.

The instinct at that point is to add more maths. More worksheets, more practice, a tuition centre on Saturday mornings. Sometimes that works. Often it does not, and the reason is simple: more of the same maths does not help a child who is stuck at something from two years ago.

1Why 1 on 1 works for a child who is behind

1 on 1 maths classes work better for struggling children because the lesson can begin at the exact point where the child got lost, and a group lesson structurally cannot do that. In a group of eight, the tutor teaches the topic the group is on. If your child’s real problem is that place value never quite clicked in Year 3, sitting through a lesson on decimals is not remediation. It is watching a building go up on a foundation that was never poured.

Maths is unusually unforgiving this way. History or geography can be learned in almost any order. Maths stacks. Fractions rest on division, division rests on multiplication, multiplication rests on a solid sense of what numbers are. Miss one layer and everything above it wobbles, no matter how hard the child works on the top layer.

2What the evidence says

The research consistently favours smaller groups, with one to one at the top. The Education Endowment Foundation reviewed the evidence and reports that one to one tuition produces around five additional months of progress on average, drawing on 123 studies. Their separate review of small group tuition, defined as one tutor with two to five children, puts the average at around four additional months, and states plainly that as a rule of thumb the smaller the group the better.

Two points of honesty about that evidence. First, the gap between one to one and a group of two or three is real but not enormous, and some studies find small groups do just as well. Second, the same reviews note that one to one is more expensive, which is why schools often choose small groups. That is a budget conclusion, not a learning conclusion.

The important detail for parents is that these averages cover all children. For a child who is specifically behind and has a specific gap, the case for individual attention is stronger than the average suggests, because the whole value of one to one is doing something different from what the group is doing.

3The real problem with group tuition

The core problem with group tuition for a struggling child is that the child who most needs to speak is the child least likely to. A confident student asks the question. A child who is behind, sitting with peers who seem to understand, learns very quickly that the safest strategy is silence. They nod. They copy the working from the board. They hand in something that looks like an attempt. And nobody, including the tutor, finds out what they do not know.

There is a second issue, which is pace. A group lesson moves at the pace the group can bear, which is roughly the pace of the middle. For a struggling child that is always slightly too fast, and being slightly too fast for forty minutes a week, every week, compounds into a widening gap.

None of this is a criticism of group tutors, who are often excellent. It is arithmetic. Forty minutes divided by eight children is five minutes of individual attention, and that is before anyone asks to go to the toilet.

4Finding the exact gap

The single most valuable thing a 1 on 1 maths tutor does is diagnose, and it usually happens in the first lesson. A good tutor does not open the textbook at the current chapter. They ask the child to talk through a few problems out loud, starting easier than expected, and they listen for where the explanation goes vague.

What they find is often not what the parent expected. A child who “cannot do fractions” frequently turns out to be fine with fractions and shaky on division. A child failing word problems is sometimes a strong mathematician who is reading the question too fast. A child who is slow at everything is sometimes just not fluent with times tables, so every question costs them triple the effort and they run out of time and patience.

Each of those has a different fix, and none of the fixes is “more practice on the current chapter”. This is the part of tutoring that cannot happen in a group, because it requires one adult listening to one child think.

5The confidence factor

Confidence is not a soft extra in maths, it is part of the machinery. Research on maths anxiety shows that anxious thoughts consume working memory, the same limited mental workspace a child needs to hold numbers in mind while working. A longitudinal study of primary school children found anxiety affecting maths performance partly through this working memory route, and that its effect strengthened as children got older.

The practical meaning is uncomfortable. A child who is embarrassed in front of classmates is not merely unhappy, they are mathematically impaired in that moment. Some of what looks like weak ability is capacity being spent on worry. Remove the audience and a portion of the problem disappears on its own.

This is why parents often report the change in mood before the change in marks. The child stops dreading Tuesday. They volunteer an answer at school. The test scores follow later, usually a term behind the confidence.

6When group tuition is the better choice

Group tuition genuinely beats 1 on 1 in several situations, and it is worth being straight about them. If your child is doing fine and simply needs steady practice and structure, a small group is effective and costs less. If your child is motivated by other children and enjoys a bit of competition, a group can lift them in a way individual lessons will not. If the aim is exam drilling for a child who already understands the content, group works well.

There is also a social argument. Some children who work alone all week benefit from learning alongside others, and that has value beyond the marks.

The dividing line is roughly this. Group tuition suits children who need more practice. 1 on 1 suits children who need different teaching. If your child is behind, confused, anxious, or has stopped trying, they are in the second category, and no amount of extra practice at the wrong level will move them.

7What a good 1 on 1 maths class looks like

You can judge the quality of an individual maths lesson from the next room, without knowing any maths yourself. Listen for how much your child is talking. In a strong 1 on 1 lesson the child talks a great deal, because the tutor keeps asking them to explain their thinking. In a weak one, the tutor talks and the child says “yes” every ninety seconds.

Other markers of a good lesson: the tutor starts by checking something from last week rather than launching into new material. Mistakes get examined rather than corrected and moved past. The child is asked “how did you get that” even when the answer was right. And the lesson ends with the child successfully doing something, so they finish on a win rather than on a struggle.

One more thing to look for. A good tutor tells you specifically what they found. Not “she did well today” but “she is confident with the method but loses accuracy past three digits, so we are going to slow down her written working for a fortnight”. That level of detail is the whole reason to pay for individual teaching.

8How long before you see a change

Expect the mood to shift within three or four lessons and the marks to shift over a term. That order almost never reverses, and parents who expect it the other way round tend to give up too early.

Research on tuition also suggests intensity matters: short, regular sessions across a defined period outperform occasional long ones. Practically, one solid weekly lesson plus ten minutes of the right practice on three other days beats two hours crammed into a Sunday. The right practice matters more than the amount, which is another thing a tutor who knows your child can tell you and a group class cannot.

If nothing has changed after six or seven lessons, something is wrong with the match rather than with your child. Say so, and ask for a different tutor. Any serious provider will arrange it without argument.

Start by finding the gap

If your child has stopped trying at maths, the useful next step is not a decision about tutoring. It is finding out where they got lost, because everything else follows from that. A single diagnostic lesson with a tutor who asks the right questions usually surfaces it, and it is often something specific, older, and fixable.

Whatever you decide about lessons afterwards, knowing the answer to “where exactly did this start” changes how you help at home. That is worth an hour of anyone’s Saturday.