1st March 2003, 3:24 PM
You should start memorizing your math tables up to 25 or so then. Once you get at least your subtraction tables that high, conversion takes place almost instantly just by looking at it. For that matter, you don't NEED to convert it, just get the feel for what 17:00 is.
"On two occasions, I have been asked [by members of Parliament], 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?' I am not able to rightly apprehend the kind of confusion of ideas that could provoke such a question." ~ Charles Babbage (1791-1871)