Build fluent within-20 skills with clean, kid-friendly inputβoutput function tables. Students practice addition & subtraction using three progressive sectionsβ Follow the Rule, Find the Rule, and Missing Cell Mixβwith a dedicated Equation box so learners can βshow their work.β Perfect for whole group, centers, small group, sub plans, homework, or quick checks. B&W, ink-friendly, no prep. Whatβs Inside 18 student pages (Within 20) organized into 3 sections Follow the Rule (P1βP6): +10, +5