HP HP-67

96 Function Keys
Example: Convert 38°8'56.7" to its decimal equivalent.
Press Display
38.08567 38.08567 Key in the angle.
0B B 38.1491 Answer in decimal
degrees. (FIX 4 display
specified from previous
examples.)
Notice that you had to key in 8’ as 08.
Adding and Subtracting Time and Angles
To add or subtract decimal hours, merely key in the numbers for the
decimal hours and press or [£1. To add hours, minutes, seconds,
use the (add hours, minutes, seconds) key.
Likewise, angles specified in degrees, minutes, seconds are added by
pressing ) (HHS+).
Example: Find the sum of 45 hours, 10 minutes, 50.76 seconds and
24 hours, 49 minutes, 10.95 seconds.
Press Display
45.105076
[45.1051
45.1051 FIX 4 notation from
previous example.
24.491095
0 (70002
B3 6
To subtract a time specified in hours, minutes, seconds from another
(or to subtract an angle specified in degrees, minutes, seconds),
simply use the key to make the second time (or angle) negative,
then add with the key.