* Convert to the same units: Since 1 cm = 10 mm, we can convert 1.9 cm to millimeters: 1.9 cm * 10 mm/cm = 19 mm.

* Compare: Now we have 19 mm and 35 mm. Since 35 is greater than 19, 35 mm is longer.

Answer: 35 mm is longer than 1.9 cm.