A study has found that many children are suffering from a hidden, undiagnosed condition that makes it harder for them to learn maths.
Researchers at Queen's University Belfast explored the prevalence of Specific Learning Disorder in Mathematics, also known as dyscalculia.
People with dyscalculia had difficulty understanding simple number concepts and have problems learning number facts and procedures.
Dr Kinga Morsanyi and the team from the School of Psychology studied the mathematics performance of 2,421 primary school children over a number of school years.
The researchers said they expected the number of pupils with dyscalculia to be similar to those with dyslexia.
Of the children studied, 108 had received an official diagnosis of dyslexia, but just one child had officially been diagnosed with dyscalculia.
Based on the results of the study, the researchers found 112 children who are likely to have the condition.
Dr Morsanyi said: "In society, there is sadly a widespread notion that you need a special talent to be good at maths, and that struggling with maths is normal for some people, but this is not the case and it's not something we would accept if a pupil was unable to read."
The study found that in almost all cases children who appear to have dyscalculia are not being diagnosed.
Dr Morsanyi added: "Within the sample of children with dyscalculia, 80% of the children have other developmental conditions, such as dyslexia or speech and language difficulties.
"As the current practice is to assign one diagnostic label to each child, this could partially explain why mathematics difficulties are so often ignored.
"Based on our results, it seems likely that children with persistent, serious difficulties with mathematics, unlike children with dyslexia, do not receive specialist support."
A child with dyslexia is more than 100 times as likely to receive an official diagnosis and educational support.
Dr Morsanyi said the study shows that girls tended to have higher IQs and English performance than boys.
She added: "So a similar performance in maths could actually be interpreted as a relative underperformance in the case of girls.
"This raises the possibility that girls with maths difficulties are particularly likely to not receive sufficient educational support.
"It is important to raise awareness of dyscalculia, as numeracy difficulties often lead to problems in later life, including greatly reduced employment opportunities, increased health risks and an increased risk of involvement with the criminal justice system.
"For example, 65% of prisoners have number work difficulties, whereas the figure for literacy difficulties in the prison population is lower, at 48%."