tolong dibantu jawab ya kak 1 sampai 5, pliss pakai caranya ya

Mapel : Matematika
Bab : Mengubah Satuan Panjang

1]
15 m + 8 dm
= ( 15 x 10 dm ) + 8 dm
= 150 dm + 8 dm
= 158 dm

2]
6 m + 4 dm 
= ( 6 x 100 cm ) + ( 4 x 10 cm )
= 600 cm + 40 cm
= 640 cm

3]
30 dm + 85 m
= ( 30 : 10 m ) + 85 m
= 3 m + 85 m
= 88 m

4]
5 m + 50 dm
= ( 5 x 10 dm ) + 50 dm
= 50 dm + 50 dm
= 100 dm

5]
7 dm + 60 cm
= ( 7 x 10 cm ) + 60 cm
= 70 cm + 60 cm
= 130 cm