Grow math skills with birds on a fence! Introduce, practice, and reinforce numbers with this engaging number line featuring numbers from -20 to 120! You can introduce ten numbers at a time, display as a full line, or stack as a number chart. Add in the birdhouses to demonstrate the concept of odd and even numbers and the colorful birds help with hands-on activities such as skip counting. Fresh colors make this set perfect for decorating classrooms as well as home spaces like playrooms and kids’ bedrooms. Includes 34 pieces: 14 strips of ten numbers, a zero piece, 12 birdhouses (odds and evens), and seven birds. When fully assembled, measures 25.9 feet long!