Tolong bantu jawab ya pake cara!!

1.200 Dam=….m
2.40.000 m=….km
3.30 dm=…..mm
4.25.000 cm=….m
5.40 dm+80 mm=…cm
6.7000 m+120 hm=…km
7.45 dam -120 dm=…mm
8.18 m+100 dm-48cm=…cm
9.5 km-415 m-800 cm=..n

Tolong bantu jawab ya pake cara!!