Posted by John on .
1. My favorite class is a math class.
2. My favorite class is math class.
(Which one is right? are both OK? Do they have a different meaning?)
3. I have two math classes today.
4. I have two math class today.
(Which one is right?)

English 
Ms. Sue,
This is better:
2. My favorite class is math class.
This one is correct:
3. I have two math classes today.
Since you have TWO math classes, "classes" must be plural. 
English 
Ms. Sue,
If you're taking two math classes, then it would be more accurate to say "My favorite class is algebra (or geometry or trigonometry)."