* 1 kilometer (km) = 1000 meters (m)

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

* 1 centimeter (cm) = 0.01 meters (m)

* 1 millimeter (mm) = 0.001 meters (m)

Let's convert everything to meters:

* 100 meters (m) - This is already in meters.

* 10 hectometers (hm) = 10 * 100 meters (m) = 1000 meters (m)

* 10000 centimeters (cm) = 10000 * 0.01 meters (m) = 100 meters (m)

* 100000 millimeters (mm) = 100000 * 0.001 meters (m) = 100 meters (m)

Therefore, 10 hectometers is NOT equal to 100 meters. It is equal to 1000 meters.