Finance Minister Tendai Biti in his 2011 budget said he had increased civil service salaries by 100 percent.
However, some of the teachers said they had since learnt from the soldiers who got paid this week that they had not received the promised increment.
The Progressive Teachers Union in Zimbabwe (PTUZ) president Takavafira Zhou said the teachers were attending class but doing so under protest.
“We urged our members to return to work while assessing the situation. The teachers are on a go slow and come pay day when we see there is no increment, we will strike.”
“Biti announced a salary hike but it seems there is nothing. We will prove it on pay day,” he said, adding that government cannot afford to take teachers for granted because they deserved better.