Adding two positive numbers gives a positive answer.
Adding two negative numbers gives a negative answer.
15 + 21 = 36
-15 + -21 = -36
Adding a negative number is the same as subtracting the positive.
The answer may be positive or negative depending on the size of the numbers.
25 + -31 = 25 - 31 = -6
25 + -3 = 25 - 3 = 22
These rules are incredibly important, so make sure that you know them!
Let' s have a go at some questions now.