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The multiplicative inverse, or reciprocal, of a number "x", is "1/x". For example, the multiplicative inverse of 5 is 1/5. For a fraction, just exchange numerator and denominator. For example, the multiplicative inverse of 2/5 is 5/2.
The multiplicative inverse is 1/(-0.50) = -2
In modulo 11 arithmetic, 6 is the multiplicative inverse of 2.
2 is the multiplicative inverse of 1/2 Therefore 2*1/2 = 1
3 and a half = 7/2 so its multiplicative inverse is 2/7.