Pencil, colored pencil, colored pen. Official website shows that Pulandian District Education Bureau can use pencils, colored pencils and colored drawings in the second volume of the fourth grade mathematics examination of Tiexi Primary School. Different tools can be used in the fourth grade math drawing problems, including pencils, colored pens, colored pens, colored paper, rulers and so on. According to the requirements and personal preferences, we choose to use different tools to draw.