Build fluent within-20 skills with clean, kid-friendly input–output function tables. Students practice addition & subtraction using three progressive sections— Follow the Rule, Find the Rule, and Missing Cell Mix—with a dedicated Equation box so learners can “show their work.” Perfect for whole group, centers, small group, sub plans, homework, or quick checks. B&W, ink-friendly, no prep. What’s Inside 18 student pages (Within 20) organized into 3 sections Follow the Rule (P1–P6): +10, +5