120dm (decimetres) = 0.012km (kilometres)
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1 km = 10000 dm 20 km = 200000 dm
2 km = 20,000 dm
515 km = 515 x 10 dm = 5,150 dm
Assuming decimeters.... 0.0001 km Algebraic Steps / Dimensional Analysis 1 dm*1 km 10000 dm=0.0001 km
1 km = 10 dm