a) 4km 382m = \(4 \dfrac {382}{1000}\)km = 4,382km ;
2km 79m = \( 2\dfrac {79}{1000}\)km = 2,079km;
700m = \( \dfrac {700}{1000}\) km = 0,7km.
b) 7m 4dm = \( 7\dfrac {4}{10}\)m = 7,4m ;
5m 9cm = \( 5\dfrac {9}{100}\)m = 5,09 m ;
5m 75mm = \( 5\dfrac {75}{1000}\)m = 5,075m.