Equations: Identify the Operation to Solve Addition and Subtraction Word Problems . Understandings to look for: • Students who can represent a one-step word problem as an equation in the order presented in the story. • Students who can identify if a one-step word problem involves addition or subtraction by identifying if the story involves joining or separating. • Students who can identify if the numbers in a one-step word problem represent parts or the total. • Students who can identify the ope