## Lesson: Measurement

Developing the Concept

Finding perimeter is a skill that children need to practice in order to develop proficiency. Becoming familiar with perimeter is important to laying a foundation for children's understanding of geometry.

**Materials:** square or rectangular objects to measure, such as books, checkerboards, shoe boxes, picture frames, crayon boxes, or pencil boxes, for each child or group of children; linking cubes (enough for each child or group of children to measure the perimeter of the object)

**Preparation:** none

**Prerequisite Skills and Background:** Children should know how to measure by using linking cube trains. They should understand how to line up the edges to get an accurate measurement.

**Wrap-Up and Assessment Hints **

Measurement provides children with helpful hands-on experiences with geometric figures like those they encountered in Geometry and Fractions. It can help them to develop their sense of spatial relationships, which is fundamental to their understanding of geometry. As you provide opportunities for measuring the perimeter of objects, you can assess how well the students understand the measuring process. Do they understand the concept of perimeter? Do they line up the clips correctly? Do they understand the need for precise measurement? For children who have difficulty, provide objects that are smaller and more easily measured, or pair such children with classmates who have mastered the skill.