Learning Wrap-Ups Operation Table, Additions, Grades 2-6 The Learning Wrap-Ups addition wrap-up key set helps your kids improve their mathematic skills and offers learning with fun activities. This set contains 10 self-correcting boards with 120 basic facts.This Learning Wrap-Ups addition wrap-up key set comes in a key shape with a rivet at the top that keeps it together. A string is attached for easy use and organization. Wrap the string from the problem on the left to the answer on the right, and then turn the wrap up to cross-check the answers. The set helps improve children's mathematical and problem-solving skills. A fun and unique way to help students memorize their math facts!. Made of durable and long-lasting plastic to ensure product longevity. Includes 10 keys and cover facts from 1+1 to 10+12 and everything in between. Recommended for grades K+. Sold as 1 Each. Sold as 1 Each. A fun and unique way to help students memorize their math facts!. Made of durable and long-lasting plastic to ensure product longevity. Includes 10 keys and cover facts from 1+1 to 10+12 and everything in between. Recommended for grades K+.