TREND - Subtraction 13-18 Skill Drill Flash Cards, 3 Packs 4104 this easy-to-use formula ensures your

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TREND - Subtraction 13-18 Skill Drill Flash Cards, 3 Packs 4104 this easy-to-use formula ensures yourContent 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. 99 cards per pack, 3" x 6". For ages 6 and up. Sold as 3 identical packs of flash cards.