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The opposite of an even number is an odd number.
The opposite of 0.1 is -0.1. In mathematics, the opposite of a number is the number that, when added to the original number, equals zero. Since 0.1 is a positive number, its opposite would be a negative number with the same magnitude but in the opposite direction on the number line.
In number systems , the opposite of the number can be represented by changing and reversing the sign of the number. If 0.93 is the number then the opposite of the number would be -0.93
Twice a number means to multiply the number by 2