Tolong bantu saya 20m+200dm-40cm= cm

20m+200dm-400cm
=2000+2000-400
=3600 cm

20 m=20 x 100 =200 cm
200 dm= 200 x 10 =2.000 cm
40 cm=40 cm
200+2.000=2.200 cm
2.200-40=2.160 cm