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There are 10 centimeter in 1 decimeter

120 x 10 = 1200

120 decimeter = 1200 centimeter

1200 centimeter is your answer

hope this helps
120 dm (1m/10dm)= 12 m 

12m (100cm/ 1 m) = 1200 cm

so i went to the base unit which is meters because we know that 1m = 10 dm

and 100 cm = 1m 

hope this helps

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