Question

How do you convert 6/12 into a decimal

Answer 1

simplify 6/12 to 1/2
and we can easily convert 1/2 into a decimal, it's just
0.5, or one half

Answer 2

Every fraction is a short way of writing a division problem. 
A fraction means (the top number) divided by (the bottom number). 
When you go ahead and  actually do the division, the quotient you get
is the decimal form of the fraction.

If you'll either pick up your pencil, or pick up your calculator, and divide  6  by  12 ,
you will get the decimal form of the fraction  6/12 .  If you don't get  0.5 then you
made a mistake and you should try again.