Adding two positive numbers gives a positive answer.

Adding two negative numbers gives a negative answer.

Examples

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.

Examples

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.