EDM 4 Common Core aligned. You will need to have the Teacher Edition and Student Workbooks to teach these lessons. Unit 3 is number stories. In this unit, children continue to use addition and subtraction to model and solve number stories. They also connect counting to addition and subtraction. Everyday Mathematics 4. It contains many slides that are visually appealing and interactive.You will need to have a smart board or smart notebook software to use these.