What Whole – Part = Part within 20 consists of 135 subtraction sum cards (once cut) using the Part/part/whole principal. Children can use plastic letters or a black dry wipe pen to fill in the blanks. Concrete materials can be used in conjunction with the Part/Part/Whole set page if needed. Alternatively, this resource may be left as A4 cards or photocopied to make into a workbook/sheets.
