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(Interesting side note: Easy way to figure reciprocal runway or course heading. +2/-2 rule. On a 3 digit course heading if you can add 2 to the first digit, then subtract 2 from the second, otherwise subtract 2 from the first digit and add 2 to the second. (last digit always stays the same) so.....reciprocal course of 257 is 077. ) Remember 1st digit will always be 3 or less.
easier way would be to look at your chart which should be out while you're in the air. or the airport diagram which should also be out.