Addition flash card set includes 55 cards with bold easy-to-read numerals and answer on the back. Each card holds two problems, giving 110 addition drills. Also included, a card for parents gives tips and ideas for teaching with flash cards. Large format (approximately 3 x 5' ) cards are printed on card stock and fit intoreusable storage box. For kids 6 and up. Cards include math addition using 1 to 12.