Add minutes on the clock

Add time the way a clock does. A clock shows 4 hours 45 minutes. Add 30 minutes: the minute hand goes past the 12 and on to the 3, and the clock shows 5 hours 15 minutes. On the calculator, press . Type 4, press the , type 45, press the again, and type 0. Press . Then type 0, press the , type 30, press the and type 0. Press : 5°15'0.". The calculator carries 60 minutes into the hours, just as the clock does.