Answer :

iGreen
Just divide.

[tex]\sf\dfrac{7}{12}\rightarrow7\div12\rightarrow0.58\overline{3}[/tex]

0.583333. . .
      ^ This is the thousandths place

Look at the number after that, if it's 5 or more we round up, if it's 4 or less we round down.

It's 3, so we round down to 0.583.
12 goes into 100 8.33 times then you multiply that by 7 and get 58.3 which is actually .583