Those numbers had grown significantly over the years.
"There's an increasing need, and this is due to a general population increase, the dissolution of wider family support for children, a lot of younger parents, some gang culture, neo-liberal policies that have tended to increase inequality, and a wider range of deprivation across some sections of the community.
"All this is creating a need for extra support for many students," he said.
He saw a range of children, including those with autism spectrum disorder, foetal alcohol syndrome, Down syndrome, learning difficulties, and victims of abuse.
"It's about ensuring a young person can achieve an appropriate level of independence given their issues, and they need support to do that. Otherwise it's not cost-effective," Mr Marchant added.
Learning support workers need better pay to attract people to the field, and more resources.
The starting salary was a little under $50,000, rising to a top range of around $80,000.
"Our relativity to the median wage has reduced hugely, and when individuals think about what their career might be, and they're going to go to university for seven years, that's a big factor in determining where they go," he said.
"I've been 20 years a psychologist, only 10 years with the ministry. Prior to that I was a consulting psychologist working privately. The hourly rate was significantly higher than what the ministry pays."