Subtraction 13-18 Skill Drill Flash Cards

Content-rich math cards do their job, teaching students new skills in a fun way. This educational aid develops basic subtraction skills 13-18. Self-checking, answers on card backs. Sturdy cards and storage box. Students will delight in mastering new skills. No-see-through cards with quick-sorting, rounded corners. Includes 99 cards, 3" x 6". For ages 6 and up.