A third teachers' union has said Government figures on the impact of budget cuts in schools are wrong.

The Teachers' Union of Ireland said it believes 1,200 second-level teaching jobs will be lost, and not 200, as stated by Minister for Education Batt O'Keeffe.

Meanwhile, General Secretary of the Irish National Teachers' Organisation John Carr has said budget provisions increasing class sizes are the most callous, savage attack ever undertaken against primary school children in this country.

On RTÉ Radio's Morning Ireland, he said Irish children are going to be in the largest class sizes in Europe.

He added that from 1 January there will be no replacement if a teacher is sick, which may result in children being sent home.