Pre-Algebra · Grades 6 to 8
Integers and negative numbers
Add and subtract positive and negative whole numbers.
The idea
An integer is a whole number. It can be positive, negative or zero. On the number line, positive numbers sit to the right of zero and negative numbers sit to the left.
Adding a positive number moves right. Adding a negative number moves left. Subtracting a number gives the same result as adding its opposite.
Worked examples
- How to Add and Subtract Negative Numbers Work out -7 + 3 - (-4) with the number line. Four steps, the reasons for each move, the sign mistakes to avoid and practice answers.
- How to Multiply Negative Numbers Multiply -6 by 4 and see how the sign rules work. Four steps, the odd-count rule, and the sign mistakes that cost marks.
- How to Divide Negative Numbers Work out -42 divided by 7 and learn the division sign rules. Four steps with the odd-count rule and the mistakes to avoid.
Practice this topic
3 problems with answers.