Classic Reproducibles Addition Subtraction 11-20 Grades 1-2 - Frank Schaffer Classic Reproducibles Author:School Specialty Publishing This title features activities that reinforce addition and subtraction double-digit facts from 11-20. Each worksheet clearly states the skill to be practiced, and presents the problems in both vertical and horizontal formats. Students will enjoy math practice as they color pictures and solve puzzles on these engaging ... more »pages. Perfect for small group practice, learning center activities, and individual learning. Answer key included. Reproducible.« less