The integers are the positive and negative whole numbers and include zero.
I = {...-4, -3, -2, -1, 0, 1, 2, 3, 4...}
Use a number line when adding and subtracting integers. The first integer is the starting point on the number line.
Addition
- When adding a positive integer, move to the right.
e.g. 4 + 2 = 6
- When adding a negative integer, move to the left.
e.g. 4 + − 2 = 2
Subtraction
- When subtracting a positive integer, move to the left.
e.g. 4 − 2 = 2
- When subtracting a negative integer, move to the right.
e.g. 4 − − 2 = 6
Multiplication and division
The rule is the same for both multiplying and dividing two integers.
- If the signs of the two integers are the same, the answer is positive.
- If the signs of the two integers are different, the answer is negative.
The table illustrates these rules:
Examples:
For practice with integer calculations − 
