Research suggests that a number line is not appropriate for PreK-1st grade when learning math. Instead they recommend the use of a Number Path. This number path has 1-20 with the color changing every five to emphasize the benchmarks of 5 and 10. This document is meant to be printed on 11x17 paper. You can laminate each individual number path and tape to students' desks to use just like they would have used a number line.