A major casual teacher shortage means almost 10,000 lessons are happening without adequate educational support in public schools across New South Wales every day.

That’s the finding of a survey of 2,100 schools conducted by the NSW Department of Education.

It found a 42 per cent shortfall in the number of casual teachers is driving the problem and it warns that almost every public school surveyed is affected.

So, how does your child’s situation stack up?

Where are the greatest shortages?

Connected Communities schools, which are predominantly in Aboriginal communities, and regions like Deniliquin, Gundagai, Mudgee, Mooki and Barwon fare the worst with at least 70 per cent of schools impacted by the shortage.

Rural, regional, and outer metro areas are also significantly impacted by the shortage.

NSW Teachers Federation acting president Henry Rajendra said, typically, students who were the most adversely affected were those in areas where educational outcomes needed improving.

“This is not good for any student but, of course, it’s impacting our most disadvantaged communities and therefore our students within those communities,” he said.

Within Greater Sydney, more than 70 per cent of schools in the Hawkesbury and Mount Druitt reported shortages, so too did the majority of public schools in Eastern Creek, Quakers Hill, Wollondilly, Liverpool, and Auburn, the survey found.

“Whether it’s in regional and remote areas or areas across Western Sydney and south-west Sydney; they don’t deserve this. They need to be treated as a priority for the system. They’re learning matters as much as anybody else.”

NSW Education Minister Prue Car agreed, flagging that when there were not enough teachers to cover a given lesson, students often ended up in merged classes.

In high schools, she said the situation was even worse with multiple classes often being placed together in a library or even outdoors where students may be supervised by just one teacher.

“That really isn’t good enough,” Ms Car said.

“That’s the single biggest way we can actually improve the outcomes for our kids.”

Ms Car said the government would review the findings to determine how the problem could be solved.

Is there an easy fix?

The NSW Teachers Federation wants the government to hire permanent substitute teachers.

It argues doing so would reduce workload pressures and provide relief support during absences.

“So should a teacher take leave for or attend a professional learning course there is someone that is in the school that can provide that cover and also very familiar to those students in that school and therefore program continuity is a priority,” Mr Rajendra said.

While Ms Car would not be drawn on what further measures the government would take to address the ongoing shortage, she did point to a new teacher pay deal which came into effect this week.

The deal was struck last month and makes NSW teachers the best-paid in the country. 

Both the minister and the union place much of the blame on the previous Coalition government, with Mr Rajendra saying the situation was the result of “12 years of failed education and wages policy” that have left teachers exhausted and facing unsustainable workloads.

But he said fixing the problem was now on the Minns government and it needed to do more than just bump up pay packets.

“In an era of teacher shortages, what that means for those that still remain at school, they’ve got to pick up the load in some way,” Mr Rajendra said.

He added that teachers were “exhausted and burnt out” and that preventing them from leaving the system should be a priority.