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While they are doing the warm-up , I walk around the room and stamp the weekly sheets . Note that this does n't affect assignments that you collect and grade , just those that you " check in " . When there are varied answers students write on the board or on transparencies and we compare and correct responses . In terms of length , they tend to me on the short side . In one , they write the answer to the warm-up , in the second they write the homework assignment ( these are 8th graders , they do n't remember ) and in the third I use rubber stamps to check if the homework is completed . I followed the suggestion of my mentor and started off class with a sponge activity on the board or overhead . But I counted homework for as much as 30-40 of their grade , so students could n't afford to slack off ( if they wanted a decent grade ) .