The first thing you should know to answer this question is the following conversions: 1Km = 1000m 1m = 1000mm 1Km = 1000000mm 1m = 100cm By making the conversions to the same unit, we can know what measure is greater: 1.2Km = 1200m 120600cm = 1206.00m 1220000mm = 1220m 120m = 120m Answer The biggest measure is 1220000mm = 1220m