Grow math skills with birds on a fence! Introduce, practice, and reinforce numbers with this engaging On the Fence Number Line -20 to +120. Introduce ten numbers at a time, display as a full line, or stack as a number chart. Use the birdhouses to demonstrate the concept of odd and even numbers. 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. Each set includes 14 strips of ten numbers, zero piece, 12 birdhouses (odds and evens), and seven birds. Sold as 2 complete sets. Recommended age 4-12 years