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Around 29,000 primary school teachers are walking off the job on Wednesday, citing poor pay and working conditions as the reason for the strike.
The Government has offered a pay rise ranging from a 6.1 percent increase for the top of the pay scale, which would bring the maximum teacher's salary to about $80,600, to a 14.7 percent increase to the entry salary, bringing it to $55,030.
But teachers have asked for a 16 percent increase over two years, alongside extra learning support and more time for teaching.
The country's largest rally is planned to begin at Fort St and end roughly half way up Queen St in Aotea Square.