What do people mean when they refer to the “cost of living,” and how is it determined? About how much does it cost your family to live each month? Each year? To live comfortably? To live with luxury? Does it take two incomes to live comfortably? How much do you need to save each month to go to college? Should college be free? This guide prompts math teachers to frame numbers and operations in Base Ten learning using big, open-ended driving questions, multimedia resources, and potential projects that are relevant to students’ lives. In addition, the guide offers tips for engaging students with multiple modes of representation and assessment.