No more losing flash cards to the bottom of the minivan! 169 flash cards are hole-punched and come with two 2" diameter rings to keep them together. Color-coded by number family, with durable rounded corners and a kid-friendly 2.5" x 4" card size, these flash cards are perfect for use over and over again. Answers are shown with the problem on the back of the card. Addition Facts 0-12.