Here’s a great idea for Middle and High School teachers! The Clothesline is a manipulatable number line that costs about $5.00 to construct and can be used to teach concepts in Number, Algebra, Functions (graphs), and Geometry.

Here is a video demonstrating some Clothesline activities:

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

Although these activities are designed for use in Middle and High School classrooms, a manipulatable number line is also useful for exploring number concepts with younger students.