Everybody loves a challenge! Help children build confidence and achieve success with fun 3-piece 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. Instructions in English and Spanish. Each set includes 15 two-sided, three-piece puzzles, 45 pieces total. per puzzle. Sold as 2 sets for a total of 30 puzzles (90 pieces).