The whole units of degrees
will remain the same (-121.135° longitude, keep 121°).
Multiply the decimal by
60 (.135 * 60 = 8.1).
The whole number becomes
the minutes (8').
The remaining decimal is
multiplied by 60 (.1 * 60 = 6) and becomes the seconds (6").
Take your three sets of
numbers and put them together, using the symbols for degrees (°), minutes
(’r;), and seconds (") 121°8'6" longitude.