The Trend Enterprises Subtraction 0-12 All Facts Skill Drill Flash Cards are educational math flash cards designed to help students practice subtraction skills. Produced by TREND enterprises, Inc., the flash cards are made in the United States and cover subtraction facts from 0 to 12. These flash cards provide a convenient and effective way for students to review and practice subtraction concepts, making them a useful tool for enhancing math skills and knowledge. All Cards Are Present And In Very Good Condition. Shipped Free With USPS Media Mail. Inv 22