How many decametres in 30 decimetres?

Answer 1

deca- prefix means 10

deci- prefix means 1/10

→ 1 decametre = 10 m

→ 1 m = 1/10 dam

& 1 decimetre = 1/10 m

→ 30 dm = 30 x 1/10 m

= 3 m

= 3 x 1/10 dam

= 0.3 dam