This number line is a fantastic tool to help visually demonstrate basic concepts in counting, adding, and subtracting. The number line is made up of 12 individual sections when combined forms a number line from -20 to 100. Each section is 4” x 36”. Educational products, manipulatives, and kits incorporate applied math and science principles into classroom and homeschool-based projects. Teachers in pre-K, elementary, and secondary classrooms use educational kits, products, and manipulatives alongside math, science, literacy, and STEM curriculum to demonstrate concepts and real-world applications through hands-on activities. SMALL PARTS. Not for younger than 3 yrs.