Express 45 mm in cm , m , and km using decimal Share with your friends Share 2 Nandini Jindal answered this 45 mm = (45/10) cm = 4.5 cm 45 mm = (45/1000) m = 0.045 m 45 mm = (45/1000000) km = 0.000045 km 5 View Full Answer Praveen Babu Kodru answered this 45 mm = 4.5 cm45 mm = 0.045 m45 mm = 0.000045 km 1