Some include:
Positives and Negatives
Derivatives and Integrals
Adding and Subtracting
Multiplying and Dividing
Reciprocals in fractions such as 1/2 and 2 (2/1)
In a triangle there is the base and the adjacent leg to it.
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It means negatives
Zero
The concept of an opposite is simple. The opposite of a number is a negative. For example, the opposite of 35 is -35.
The opposite of x is -x.For example,the opposite of three is -3.The opposite of a negative number is positive.Fore example,the opposite of -7 is 7.
There are opposites of some adverbs and adjectives. The idea of "opposites" is conceptually weak and not all words have opposites.