This beach themed sorting activity is perfect for teaching number sense 0-20 in preschool, kindergarten, and the beginning of first grade. The beach theme works well for the end of the school year, summer school, or the beginning of the school year. This resource includes half-page size color, less color, and black/ white sand pail number mats with the numbers 0-20 along with alternate one-fourth page size sand pail headers in color or black/ white. It also includes color and black/ white shell,