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Consider the case when a teacher has thirty students in the class. The noun "homework" is uncountable so he cannot say "I have thirty homeworks to grade every week." My question is that if there is any unit of homework so that the sentence "I have thirty (units) of homework to grade every week" can be valid?

Edit:

- After reading the replies, I think I should make the situation more clear. I myself am a math TA. What our students need to do for homework is usually about ten exercises from the textbook. I feel if I ask another TA how much homework he needs to grade, the usual reply will be like, "I have two sections, fifteen students each, and we have one assignment every week." Since the amount of exercises is usually the same, we don't really care about it. The amount of homework to grade mainly depends on how many students we have. But I always feel this kind of reply to be very indirect. So my precisely question is if there is any way to reply the question "how much homework do you need to grade?" by saying "I need to grade thirty (units) homework every week."
- Based on what I see from the replies, I have the impression that different countries have different answers for this question. Is this true? I'm on the west coast of the US so the way in which people there answer this question is what I care about the most. But I'm still interested in knowing the difference.

7But, Chris,

you'dneed to telluswhat unit is important. What did you count to reach thirty? Was it questions, exercises, assignments, workbooks? Was it students or classes? Until you tell us, we don't know. – Gary Botnovcan – 2018-08-09T15:21:22.553