(Ideal for teaching ages 5 and older) Everybody loves a challenge! Help children build confidence and achieve success with fun 3-piece Fun-to-Know® Puzzles that hone their skills at their own pace. Only matching pieces fit together, so kids can learn by trial and error. Practice addition. Photos for real-life learning on front, numbers on back. Durable, 3″ x 3″ pieces. Sturdy storage box. 15 two-sided, three-piece puzzles. 45 pieces.