FLAME: Unit 4 builds confident understanding of teen numbers through clear, intentional, and developmentally appropriate instruction. Students learn the structure of numbers 11–19 and explore number 20, building a strong foundation for place value. This unit also introduces the Growing 100’s Chart (11–20), giving students repeated exposure to number patterns while engaging in hands-on activities that deepen their understanding. Lessons follow the FLAME routine—subitizing, visual and auditory dri