Here's how to convert hectometers and decameters to meters:

* 1 hectometer (hm) = 100 meters (m)

* 1 decameter (dam) = 10 meters (m)

Calculations:

1. Hectometers to meters: 7 hm * 100 m/hm = 700 m

2. Decameters to meters: 3 dam * 10 m/dam = 30 m

3. Total meters: 700 m + 30 m = 730 meters

Therefore, there are 730 meters in 7 hectometers 3 decameters.