Quick Stations and Centers for Common Core Level: Second grade Common Core Standard ccss.math.content.2.oa.a.1 Adding and Subtracting within 100 to solve one and two-step word problems Introduction These stations are designed for quick set up and use as a specific station or center. They can be used as additional material or differentiated instruction. You may make additional copies of these materials as needed. Station D (3 part subtraction) (see other stations for other steps in the standard)