Multiply km by 10,000 (1km = 10000dm).
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1 km = 10000 dm 20 km = 200000 dm
1 km = 10 dm
2 km = 20,000 dm
Km
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.