Hand a five-year-old a box of mixed blocks, and the sorting usually starts on its own: squares here, triangles over there. This kindergarten shape classification worksheet turns that urge into five quick rows. Every row shows five gray outlines drawn from squares, stars, pentagons, triangles and hearts. Four shapes in a row belong together and one does not, so the rule changes from row to row. Your child circles the shape that is different. There is no color to help, only the outline. The PDF includes an answer key on its second page.