TEST PREP MATH Challenge Cards™ (Ideal for teaching 1st Grade to 3rd Grade) Spark laughter and learning with questions about charts, graphs, measurement, money, time, algebraic thinking, and other math subjects. Versatile cards adapt to growing abilities for endless rounds of learning fun and mastery. Great for school, home, or on the go! Durable, no-see-through cards with quick-sorting, rounded corners. 56 two-sided cards, 3⅛” x 5¼”.