115
+5 and -20
You could add a negative number. ex. 98 + -100 = -2
commutative
You add the lengths of all sides to get perimeter.
Adding a negative number to a negative number makes a larger negative. In order to solve this you add the numbers together as a positive then add a negative sign.
115
Negative
You get a positive Number answer.
When you add a negative number, the one on the right side gets cancelled out. E.g. -3x + - 3x = -3x
Adding two negative numbers always gives a negative number.
You get a positive number because a negative number reverses the other negative so it becomes a positive number.
You have to take the negative sign away from the negative number and add them.
The product of an odd number of negative numbers will be negative.