Learning Advantage: These large (3" x 10") vertical format cards show the problem on one side and the problem with the answer on the back. The large, bold easy-to-read numbers are great for classroom use. Teaches math facts 1-10. Addition cards have Ten-Frame feature for visual learners. Cards are numbered with notched corners for easy sorting. Features Fact Family format: Addition card #2 (1+0=1) covers the same subtraction fact on subtraction card #2 (1-0=1). Multiplication and division cards use the same Fact Family format. 125 cards per set includes blank cards for future use.