Engage your students with this motivating beach day-themed math activity that targets ways to represent numbers to 20. This hands-on, flexible math center is perfect for practicing or reviewing number sense to 10 or to 20 at the end of the school year, during the summer, or at the beginning of the school year. Add a little bit of fun in the sun to your small group instruction or independent math stations in preschool, kindergarten, or first grade. This is NOT a cut-and-paste activity.