Help children build confidence and achieve success with fun, three-piece puzzles that hone their skills at their own pace. Only matching pieces fit together so students can learn by trial and error while they practice addition. Durable pieces offer photos for real-life learning on front and numbers on back. Each piece measures 3" x 3". The Easy Addition Fun-to-Know Puzzles set includes 15 two-sided puzzles. Puzzles are ideal for teaching students ages 5 and up.