Just learning to recognize numbers from 0-20? Just getting to know how a number line works? This focuses on number recognition from 0-5, 6-10, 11-15 and 16-20. There is also a focus on creating and using number lines from 0-20, 0-30 and 0-50. This has been created in both Black and White and Color to provide individual engagement as well as time to work in small group time in order to revisit concepts over the coming weeks as needed without needing to reuse paper. Centers. RTI.