They receive suggestions and compliments from their classmates and then, using this advice, they improve their own work. Mathematics Fourth graders work with numbers up to 999,999. Fourth graders will be able to read numbers up to 999,999. They learn to add and subtract numbers in the thousands, ten thousands and hundred thousands. They write numbers out in words and can change numbers to expanded notation.
Fourth graders continue to multiply and divide.
Fourth graders study geometry. Fourth graders study polygons and polyhedra. They learn to identify line segments, rays, vertices and midpoints. They can calculate the area and perimeter of figures made up of square units. Fourth graders solve problems that contain several steps.