5Let's Leap Ahead flash cards help students learn subtraction from 0 to 12. Kids learn best with materials they find fun and exciting, and our smartphone design is specially crafted to get kids excited about learning. The rounded top edge allows for easy sorting. The flash cards package includes a gift card so students can continue learning with Math Friendzy, the most complete, fun, and educational app in iTunes and Google Play. Instructional Cards with games and strategies provide additional opportunities for practice.