Send a piece of paper, the size is 35cmx28cm. The quality of that paper is very thin, but it is still enough to pass a math exam. When taking a math test, choosing to fill in the blanks is mainly a waste of paper. In fact, you don't need paper to make big questions, and you don't choose to fill in the blanks in the calculation of the answer. The key is whether your thinking is right or not. I suggest you use more paper when you fill in the blanks. If you write the whole process on paper first, you will never finish the big problem.