Matematika 45 dm - 120 dm=....mm 19 m + 100dm - 48cm=....cm 5 km - 415m - 800cm=.....m

1) 45 dm - 120 dm = -750 mm
2) 19 m + 100 dm - 48 cm = 2852 cm
3) 5 km - 415 m - 800 cm = 4577 m