This answer is not correct. 

You probably inverted the conversion factor g/10dg thereby multiplying instead of dividing by ten. Another common error is to try to make the conversion in one step by figuring out a conversion from decigrams to milligrams directly. You will make far fewer errors if you do these step by step using the definitions of the prefixes used...deci = one tenth. Most people also make fewer errors if they use whole numbers; g/10dg rather than 0.1g/dg.