EJ 1: 73 m - 0.5 m = 72.5 m.
EJ 2: 61 cm - 10 cm -0.5 cm = 50.5 cm.
EJ 3: 504 cm - 20 cm - 100 cm = 384 cm.
EJ 4: 900 cm - 50 cm = 850 cm.
EJ 5: 250 mm - 4mm = 246 mm.
EJ 6: 340 cm - 12 cm = 328 cm.
EJ 7: 6 m - 0.04 m = 5.96 m.
EJ 8: 85000 mm - 40 mm - 78 mm = 84882 mm.
EJ 9: 5 m - 0.05 m = 4.95 m.
EJ 10: 10 cm -1000 cm =990 cm.
