Remember the rules for adding two numbers.

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

Adding three positive and negative numbers is done in stages using the rules above.

Examples

25 + -31 + -1 = 25 - 31 - 1 = -6 - 1 = -7

25 + -3 + 5 = 25 - 3 + 5 =  22 + 5 = 27