Question

What does it mean to multiply a number by -1?​

Answer 1

Multiplying a number by -1 means the sign on the number is made opposite. If the number was positive, it becomes negative. If the number was negative, it becomes positive.

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Answer 2

Multiplying a number by -1 makes the number a negative version of itself. For example, if you were to multiply 3 by -1, you would end up getting a product of -3.