EDM 4 Common Core aligned. You will need to have the Teacher Edition and Student Workbooks to teach these lessons. Unit 7 is Subtraction Fact Strategies and Attributes of Shapes. In this unit, children will continue to work on fact fluency and explore the relationship between addition and subtraction. They will also explore defining attributes of shapes. 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.