18 months & up. Introduce early math concepts, such as counting, problem-solving, sequencing, comparing, and classifying, while exercising fine motor skills with these brightly colored puzzles. Children will enjoy lining up these easy to grip familiar farm puzzle pieces from smallest to largest. Use the Size and Sequence Farm Puzzle in a lesson about animals or crops found on a farm. Encourage children to identify objects and colors as they solve this set of self-correcting puzzles.