Answer: Mathematically, it is impossible to add five matches to six matches to result in nine matches.
Logically, however, you can add five matches to six matches to make nine if one match is on fire, then you set that match on another match, and eventually both of those matches that were on fire burn themselves into ashes, leaving you with only nine unlit matches left.
Answer: You lay out the 11 matches so they spell the word NINE.
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-3.
-3
Add something to NINE to make it SIX IX is a Roman Numeral for 9 Add/ Prefix S to it to make it SIX
9+(-3)=6 6-(-3)=9
multiplied to seventy and add to nine is impossible, but add up to 9 and multiplied to -70, or add up to -9 and multiplied to 70 are possible. In that case, 14 and -5 would do it (or -14 and 5)