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Does every number have an opposite?
It depends on what you mean by an opposite. Every real number has an additive opposite but 0 does not have a multiplicative opposite.
Why does mathematicians decide not to call 1 a prime number?
1 is not a prime number because it can be evenly divided by itself and by 1, the opposite as per the definition of a prime number.
What is the opposite number of 9?
The opposite number of 9 is -9. In mathematics, the opposite of a number is the same distance from zero on the number line, but in the opposite direction. This is denoted by adding a negative sign in front of the number, indicating its direction opposite to the original number.
What are similarities and differences between the opposite of a non-zero number and the reciprocal of that number?
The answer depends on what you mean by the "opposite" of a number. A reciprocal is one type of opposite: it is the multiplicative opposite.
Does every real number have an opposite?
It depends on what you mean by an opposite. Every real number has an additive opposite but 0 does not have a multiplicative opposite.
