3600km = (3) km (600) m1t-320kg = (680) kg480mm+520mm = (1000 5) mm = (1) m7008kg = (7) t. So the two paper clips are 58 mm long. Millimeter.200 square decimeter =(20000) square centimeter 70000 square centimeter =(700) square decimeter 620000 square centimeter =(62) square meter 960000000 square meter =(960) square kilometer 18 square meter =( 1800) square centimeter. >)499kg 3m(>)300mm 700mm()900cm 3m 7cm-9cm(>)