a solid math foundation! Addition 0-12 Flash Cards show 110 problems that range from 0+0 to 12+12. Subtraction 0-12 Flash Cards include 91 problems and come with an Answer Card. Parent Cards in both packs suggest activities and strategies to extend the learning and make it fun. Do speed drills, play games, and change it up! Kids and parents who use flash cards for practice testing are using one of the most effective learning techniques available. Easy to tuck into a bag, flash cards also make great take-anywhere learning!