This activity needs to happen shortly after kids start playing with ready-made grids, or looking at grid art, or otherwise engaging with grids. Simply say: “Can you make a grid?”
Making a grid is more challenging than you may expect. Kids often draw grids cell by cell, and have a hard time keeping the structure. Some kids will probably be stuck. Don’t offer help while they are thinking; wait until they ask, however long it takes. If the child asks how to start, hint that a grid can be made by drawing, folding paper, or arranging cards and offer the materials.
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