Practice sorting by class and non-identical matching with these back to school sorting mats. There are 21 categories of school pictures, and there are 6 pictures from each category to sort. This resource can be used in a file folder, as cut and paste worksheets, or as laminated sorting mats. There are 21 categories: crayons, books, markers, tape, backpacks, computers, calculators, folders, notebooks, clipboards, glue, dot markers, pencil cases, scissors, lunch boxes, rulers, pencils, schools, sc