(Portland, OR) -- Classes are canceled again today in the Portland Public Schools district as the teachers' strike continues into its third week. The district said yesterday its bargaining team is continuing to work to negotiate an agreement with the teachers union for a new contract for the teachers. Last week, Governor Tina Kotek directed the state's chief financial officer to help both sides get financial numbers they can agree on. The district says the teachers union is calling for changes that would cost 220-million dollars more than it currently has in its budget. Teachers say the district has the money to meet their demands. The Portland Association of Teachers is demanding smaller classroom sizes and a pay raise of 21-percent over three years.