Notes

POSITIVES NUMBERS are used to describe quantities greater than zero, and NEGATIVE NUMBERS are used to describe quantities less than zero. Often, positive and negative numbers are used to show quantities that opposites direction or values.

All positive numbers just look like regular numbers (+4and4 mean the same thing). All negative numbers have a negative sign in front of them, like this -4.

As we know, all integers can be placed on a number line. If you put all integers on a number line, zero would be at the exact middle because zero is neither positive nor negative. positive and negative numbers have many uses in our world:

On a horizontal number line. Numbers to the left of zero are negative, and numbers to the right of zero are positive. Numbers get larger as they moved to the right, and smaller to move to the left. We draw ARROWS on each end of a number line to show that the numbers keep going (all the way to INFINITY and negative infinity!).

Positive (+) and negative (-) sings are called OPPOSITES, so +5 and -5 are also called opposites. They are both the same number of spaces or the same distance from zero on the number line, but on "opposite' sides.

The OPPOSITES OF OPPITES PROPERTY says that the opposite of the opposite of a number is the number itself!

The opposite of -16 is 16. The opposite of 16 is -16.
So, the opposite of the opposite of -16 is 16 (which is the same itself).