As a parent, you most likely know all too well that orphaned socks seem to constantly appear and go missing when you least expect them to. Here's a way to put those singled-out socks to good use! Plus, you'll be helping your preschooler build his number recognition skills. If you've got a child who loves puzzles, this activity is a great fit. He'll learn to identify different numbers, match like numbers together, and develop his grouping and ordering skills along the way.