First graders began a unit on measurement. Initially, they used paper clips, cubes, markers, and pencils as units of measurement. Later, they will use standard units of measurement. During their exploration, students discussed the difference between an estimated measurement and an exact measurement; they also discussed the need for both. In addition, they learned to be careful and avoid common measurement errors such as not lining up an object properly, leaving gaps between units, and overlapping units. These hands-on experiences have been both fun and educational!