They demonstrated in front of the city's public school board building. Well over 6,000 Calgary public school teachers are poised to strike Monday, which would cancel classes for 100,000 students.
Class size is the biggest stumbling block in the dispute between the board and the teachers' union.
The teachers say that there are too many students in each class and that means students are not getting all of the help they need. The 6,600 teachers want the return of a ratio of one teacher for every 18.4 students.
Alberta Premier Ralph Klein said even he expects teachers to walk off the job.
The province's education minister has urged both sides to keep talking.
School board chair Teresa Woo-Paw has said the board can't afford to meet the teachers' demands.
The present school board plans would mean that 200 teachers would lose their jobs.
3. Who wants the return of a ratio of one teacher for every 18.4 students?