The Clothesline is a manipulatable number line that makes the facilitation of class discourse on number sense much more efficient and effective. The Clothesline is dynamic, meaning that the “benchmark” numbers may be adjusted when needed, as well as the values that are placed on the line. This site contains a wealth of activities for working with Numbers, Algebra, Functions (graphs), and Geometry in middle and high school classrooms.

Here is a video demonstrating some Clothesline activities:

https://www.bigmarker.com/GlobalMathDept/Clothesline-Math-The-Master-Number-Sense-Maker