1. **State the problem:** We need to find how many more millimeters the length of Jessica's shoebox is compared to its width. 2. **Given data:** Length = 27 cm, Width = 9 cm. 3. **Convert centimeters to millimeters:** Recall that 1 cm = 10 mm. 4. **Convert length and width to millimeters:** Length in mm = $27 \times 10 = 270$ mm Width in mm = $9 \times 10 = 90$ mm 5. **Calculate the difference:** Difference = Length in mm $-$ Width in mm = $270 - 90 = 180$ mm 6. **Answer:** The length of the shoebox is 180 mm more than the width.