In this lesson, students use scales to measure the weight of objects precisely, and then use those measurements to solve one-step word problems involving the four operations and like units. For example, they find the total weight of two bags of beans and solve problems such as, "Lindsey wants to ride the roller coaster. The minimum weight to ride is 32 kilograms. She weighs 14 kilograms less than the required weight. How many kilograms does Lindsey weigh?"