Shown with a cast-on count of 40 stitches.  

• Row 1 (RS): K40.
• Row 2 (RS): K40, CO 10 sts (50 sts).
• Row 3: K50, CO 10 sts (60 sts).
• Row 4: K60, CO 10 sts (70 sts).
• Row 5: K70, CO 10 sts (80 sts).
• Rows 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, and 30: Knit.
• Rows 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, and 31: Knit.
• Row 32: K28, BO to last 28 sts, k28 (57 sts).