The original number is degree, minutes and seconds.
There are 60 minutes in an hour and 3600 seconds in an hour.
Divide minutes by 60 and divide seconds by 3600, then add to the degrees:
15 / 60 = 0.25
66 / 3600 = 0.01833
Total degrees: 32 + 0.25 + 0.01833 = 32.2683
Rounded to the nearest 100th = 32.27 degrees.