"Counting Line Segments: A Measuring Length and Perimeter Activity" is a worksheet that gives students practice counting and drawing line segments before using their new skill to measure perimeter.

Worksheets start with dotted lines on separate grids. Students count the segments between each dot and write the number below. Then, some worksheets instruct students to draw their own line on a dotted grid. They draw a line between two dots that are labeled A and B. They must draw horizontal and vertical lines without crossing lines. The first few have dashed segments to draw on, while the rest give a length and students must draw their own line segment, counting one at a time.

The end of each worksheet features different shapes with lengths measured in tick marks. Students must count how many of those segments go around the entire shape to find the perimeter.

Counting by ones is a foundational math skill that has real-world applications, like finding the perimeter of an object. Using a progression of activities helps students practice important skills while also being able to see how those skills are useful in the real world.

For example, counting line segments on a dotted grid encourages students to count one segment at a time. After they practice counting line segments, they can transfer the skill to counting the line segments around the outside of an object to find its perimeter.