Multiplying by 1 and a half.
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Dividing by twelve is the same thing as multiplying by 1/12. Thus, multiplying a number by 12/1, or twelve, is the opposite (inverse) of dividing a number by twelve.
(-1/5)
-2 (negative two) The multiplicative inverse (reciprocal) for a number x is 1/x.
Because multiplying is the inverse of dividing
Half of 420 is 210. To find half of a number, you divide it by 2. In this case, 420 divided by 2 equals 210. This is because division is the inverse operation of multiplication, and dividing by 2 is the same as multiplying by 0.5.