Help kids learn math facts with these self-checking flash cards! Each card features a math problem on the front and an answer on the back, so it’s easy for children to work independently. Plus, the cards cover every fact through 12—to help learners master all math facts. You get all 4 sets shown, each with 156-169 cards packed in a handy storage box. Cards measure 3" x 6". Each card set also available separately.