The multiplicative inverse means, what do I multiply my number by to get an answer of 1?
ex: The multiplicative inverse of 5 is 1/5.
5 * (1/5) = 1
If your number is a fraction to begin with, flip it over.
ex: The mult. inverse of 22/7 is 7/22
(22/7)*(7/22) = 1
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The multiplicative inverse is the negative of the reciprocal of the positive value. Thus the multiplicative inverse of -7 is -1/7.
In modulo 11 arithmetic, 6 is the multiplicative inverse of 2.
3 and a half = 7/2 so its multiplicative inverse is 2/7.
-1/11 is your answer.
-1/7