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a cm is 1/100 of a meter and a dm is 1/10 of a meter
23 cm
1dm=10cm=100mm60dm is therefore 6000mm, and longer than 100mm.
10 dm = 1 m so 200 dm = 20m. 20 km is 1000 times as long. This is assuming "dm" = decimetres. If it = dekametres then 200 would be 2 km.
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