Grade 6 Geometry Worksheets: Classifying quadrilaterals - K5 Learning Below are six versions of our grade 6 math worksheet on classifying quadrilaterals as squares, rectangles, trapezoids, rhombus, parallelograms or irregular. These worksheets are pdf files. Open PDF. Worksheet #1 Worksheet #2 Worksheet #3 Worksheet #4 Worksheet #5 Worksheet #6.