Is it necessary to copy math homework? That depends on how you know. If you don't copy the questions and just do them, it may be only temporary. This means that if you copy down the topic, it will actually be of great help to the later study. The later stage is the review stage, so you can review your exercise books, so you can have corresponding questions and answers, because this is a systematic and complete process. If you just do the problem, you can't review it later. Meanwhile, math.