In our school district, the 4th grade class each year makes 'quilts' for a school demo project. I've been called on for the 2 niece's classes so far. They bring their purchased fabrics and hand sewing supplies (pins; needles; thread; snips). I cut all the fabrics. They have a choice now of doing a quilt or a pillow but use the same layout for either. Large 4 patch pieces. I sew seam lines on the squares and show them how to thread needles; knot thread; sew the seams. I usually end up reinforcing their work (unbeknownst to them) and then they stuff/sandwich as appropriate to their project. Show them how to close their seam once project is turned right side out. Let the teacher incorporate any 'math' skills they want.