Value Vertical Flash Cards Addition & Subtraction Set - 90 Per Pack, 2 Packs

Notched corners for quick organization. Large, easy to handle 6-1/4" x 3-1/4" cards. Bold, heavy type to use with large groups. Durable, thick card stock (14 pt.). Self-checking. Great for small groups, pairs, and whole class participation. Great for teaching the relationship between +/-, (e.g.: 3+1=4 on one side, 4-1=3 on the reverse). Each set includes 90 cards. Sold as 2 sets for a total of 180 cards.Great for teaching the relationship of +/- and multiply/divide; (example 3+1=4 on one side, 4-1+3 on the reverse)Sold as 2 packs, each pack contains 90 classroom-size flash cardsCards measure 6.25" x 3.25"To familiarize children with the basic facts of addition and subtraction. quick recall of math basics, "mental math". application and interpretation of mathematical language for important elementary concepts. auditory/visual association.