Adding and subtracting negative numbers
Add signed numbers and subtract negatives using opposites.
- Adding a positive moves right on a number line. Adding a negative moves left.
- Subtracting a number means adding its opposite:
. - After changing a subtraction to addition, compare the sizes and signs.
Example 1
Adding a negative
Evaluate the expression.
Example 2
Subtracting a negative
Calculate the value of the expression.
Remember
“Two negatives make a positive” is a multiplication rule. For adding or subtracting, follow the operations.
Your turn
Question 1
Calculate.
Check answer
Question 2
Calculate.
Check answer
Question 3
Calculate.
Check answer
Question 4
Calculate.
Check answer
Question 5
Calculate.
Check answer
Calculate.
Calculate.
Calculate.
Calculate.
Calculate.