To convert decimeters (DM) to hectometers (HM), you can use the following conversion factors:
1 hectometer (HM) = 1000 decimeters (DM)
To convert 145.7 DM to HM, you divide the number of decimeters by 1000:
\[ 145.7 , \text{DM} \div 1000 = 0.1457 , \text{HM} \]
So, 145.7 DM is equal to 0.1457 HM.