Units of length
1. The meter
We use the meter to measure the length and width of a classroom. The main unit of length is the meter that is defined as the distance between two lines on a platinum-iridium bar, preserved at the International Bureau of Weights and Measures in Paris.
The abbreviation for meters is m.
2. Multiples of the meter
To express long distances as a race through the park, we use greater units than the meter. These are called multiples:
1 decameter is equal to 10 meters: 1 dam = 10 m.
1 hectometer is equal to 100 meters: 1 hm = 100 m.
1 kilometer is equal to 1000 meters: 1 km = 1000 m.
1 myriameter is equal to 10000 meters: 1 mym = 10000 m.