A special education teacher in Rome, Georgia was unsatisfied with tools for teaching math to elementary students. This teacher wanted something more tactile that would not be treated like a "toy" by his students. Additionally, the longest number line available only went up to 100.
According to the Slide-A-Round website, the creator writes, "Incorporating movable, interchangeable slides, I have created a number line system that can round whole numbers up to 10,000,000. It can round numbers to the nearest 10, 100, 1,000, 10,000, 100,000 and 1,000,000. During this process, I have consulted with math teachers and specialists, administrators, parents, and students from several different schools and school systems. I have also consulted with an occupational therapist, a hearing specialist, and vision-impaired specialist."
The Slide-A-Round website includes a description of the product as well as how-to videos, a product order form, and product pictures. Common core standards for elementary math are described. In addition, the makers have included several free, downloadable worksheets for the classroom, including one for rounding with 10's, 100's, 10,000's, working with fractions, and many more.
This is a great product for students who are blind and visually impaired. It gives tactile representation to abstract concepts in mathematics. To learn more about the product or to purchase it, visit the Slide-A-Round website.