Finding molar masses...why is my answer wrong ?

Question

For the molar mass of C6H12O6 I got 180.2 but it says the answer is 180.0 

There was also a note saying to round to .1gram which I did so why is the correct answer 180.0? 

Answer 1

C₆H₁₂O₆

 

Looks like they used precision to the nearest 0.1 gram when adding the molar masses for each element.

 

6C + 12H + 6O =

6(12.0 g/mol) + 12(1.0 g/mol) + 6(16.0 g/mol) =

72.0 g/mol + 12.0 g/mol + 96.0 g/mol =

180.0 g/mol

 

But, I did originally get 180.2 g/mol but that is with 0.01 gram precision.