Suppose the multiplicative inverse is x.
Then x*4 = 1
Divide both sides by 4: x = 1/4 or 0.25
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0.25
1/4 is the multiplicative inverse of 4
The multiplicative inverse is 1 / 0.25, equal to 4.
The multiplicative inverse is 1/(-0.50) = -2
The multiplicative inverse is the negative of the reciprocal of the positive value. Thus the multiplicative inverse of -7 is -1/7.