Looking up math problems means that when doing math homework, you can look up math problems again on draft paper to ensure the answers are correct.

In the usual math teaching, teachers will also remind students to test the math problem in time, and through the test, they can find out whether they have any mistakes in this problem in time. If the answer is the same before and after, it means that you have done the problem correctly. If the answer is wrong twice, you need to recalculate it to make sure the answer is correct.