The Third Grade There are two third grades at Prosperity Heights. Ms. Erickson and Ms. Reed are the third grade teachers. Both have taught in the school district for many years. In third grade we use the Every Day Math curriculum.  We also are learning a lot about being good readers and writers. Third graders are eager to learn to write in cursive. They will all learn to do this during the year. See more about each class by clicking on their web pages on the right.