Parental supervision is recommended.
Sc in each st across row, ch 1 turn. At the end of row 4 leave approximately 30 inches of yarn, cut off, pull through last loop worked so that it doesn't unravel. Starting at one end wind in circle, keeping the outer edges even. When it is completely rolled up, stitch end row down. With the 30 inches of remaining yarn, stitch from outer edge to inner circle , catching all of the rows securely.