Solved Examples

Example 1: Evaluate the following:

1. (-5 )+  9
2. (-1) – ( -2)

Solution:

1. (-5 )+ 9 = 4  [Subtract and put the sign of greater number]
2. (-1) – ( -2)

⇒ (-1) + (-2)   [Transform subtraction problems into addition problems]

⇒ (-1) + (2)    [Subtract and put the sign of greater number]

Hence,

(-1) – ( -2) = 1

Example 2: Add -10 and -19.

Solution: -10 and -19 are both negative numbers. So if we add them, we get the sum in negative, such as;

(-10)+(-19) = -10-19 = -29

Example 3: Subtract -19 from -10.

Solution: (-10) – (-19)

Here, the two minus symbols will become plus. So,

-10 + 19 = 19 -10 = 9

Example 4: Evaluate 9 – 10 +(-5) + 6

Solution: First open the brackets.

9 – 10 -5 + 6

Add the positive and negative integers separately.

= 9 + 6 – 10 -5

= 15 – 15

= 0

Integers Addition and Subtraction Worksheet