Question

8m3dm4mm cuantoscm son

Answer 1

Veamos : 1m = 100 cm    ⇒   8 m = 800 cm
             1 dm =   10 cm    ⇒  3 dm =  30 cm
            1 mm =  0.1 cm    ⇒ 4 mm = 0.4 cm
⇒ 8 m + 3 dm + 4 mm  =  800 cm + 30 cm + 0.4 cm = 830.4cm
suerte

Answer 2

8m   
1m =100cm =800 cm
3dm
1dm=10 cm =30cm
4mm
1mm=0,1cm=0,4 cm

total=800+30+0,4=830,4 cm