com/grammar/phrasal-adjectives / Grammarholic I'm also told to use the m-dash—not a hyphen—between the figures "En dashes generally appear only in typeset material; in typed or keyboarded material the simple hyphen is usually used. The en dash is shorter than the em dash but slightly longer than the hyphen. It is most frequently used (1) as replacement for a hyphen following a prefix that is added to an open compound, (2) as an equivalent to "(up) to and including" when used between numbers, dates, or other notations to indicate range, (3) as a replacement for the word to between capitalized names, and (4) to indicate linkages, such as boundaries, treaties, or oppositions.
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Grammarholichyphens in the phrasal adjectivesSee this: http://grammarist.com/grammar/phrasal-adjectives/
Grammarholic I'm also told to use the m-dash—not a hyphen—between the figures"En dashes generally appear only in typeset mat