This PowerPoint has everything you need to teach addition and subtraction to 20 for primary students. Each daily lesson includes "I can" statements, TEKS, spiral review, and instructional strategies to enable students to understand composing and decomposing numbers up to 20. Included are videos and hyperlinks, worksheet examples, learning station ideas, as well as formative and summative assessment suggestions. When viewed in "presenter mode", complete lesson design and questions are included to aide in planning and preparation. Gradual Release of Responsibility (GRR) and Depth of Knowledge (DOK) details are included.