Convert 38.6 metres to decametres.
To convert a smaller unit (metre) to a larger unit (decametre) we divide by the conversion factor.
we know that 10 m = 1 decameter
Therefore 38.6m = 38.6 ÷ 10
=38.610 (To divide a decimal by 10 move the decimal point 1 place to the left. )
= 3.86 decameter
Answer: option B. 3m