This lesson plan is perfect for 4th- and 5th-grade math classrooms. In this lesson, students will learn how to add and subtract measurements that have different metric units. The metric system is the measurement system most commonly used outside the United States, but it’s important for students to be familiar with it. This lesson will give them a chance to practice using the metric units of measure for distance, capacity, and weight/mass. By the end of the lesson, they’ll be able to convert between different units of measure with ease!