The opposite number of three is -3.
The opposite number of -9 is 9.
The opposite number of -5 is 5.
The opposite number of 12 is -12.
When the number is positive then the opposite number is negative.
And when a number is negative then the opposite number is positive.
The given numbers are;
3, -9, -5, 12
To know more about the Opposite number click the link given below.
https://brainly.com/question/11793982
