Power up essential skills with handy packs of our most popular Challenge Cards. Fun games, rich in content, big in results! Solve math word problems and play domino games for spelling / vocabulary, rhyming words, and addition sums to 9. Quick-sorting no-see-through cards Cards are 3 inches x 5 inches 4 sets: 56 two-sided cards per set Activity ideas included for solo or group play Made in USA