There are many fraction values for which you should immediately be able to recognize the decimal value of. Here are some examples:
12.5% = 1/8 = 2/16 = 4/32 37.5% = 3/8 = 6/16 = 12/32 62.5% = 5/8 = 10/16 = 20/32 87.5% = 7/8 = 14/16 = 28/32
Now you get to try a few for yourself.