You can convert any fraction to a decimal value which at least approximates the value of the fraction. Most of the time you can find decimal values which are exactly equivalent to a fraction value. Here are some examples:
1/2 = .5 1/5 = .2 2/5 = .4 3/5 = .6 4/5 = .8 1/10 = .1 3/10 = .3 4/10 = .4
1/2 = 5/10 = .5 3/5 = 6/10 = .6
Now you get to try a few for yourself.