How Do You Convert 7/12 Into A Decimal?

The easiest way is to use a calculator(7 divided by 12). If you can't use a calculator, you will have to do long division.
  .5 8 3 3 3 3 3 3 3
     ------  
12 |  7.0 0 0 0 0 0
  -6 0
  ------
  1 0 0
  9 6
  ------
  4 0
  3 6
  ------
  4