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Adding and Subtracting positive and negative numbers
- Integers are whole numbers. They can
be positive or negative. Positive numbers
are above zero and negative numbers
are below zero.
- Example:
- The temperature at 2am was -3.
By 2pm it had risen 10 degrees.
What was the new temperature?
-3 + 10=7 degrees
- The temperature at 2am was -3.
By 2pm it had risen 10 degrees.
What was the new temperature?
-3 + 10=7 degrees
- Adding a negative number is the same as subtracting a positive number.
6+-4 is the same as 6-4=2
- Subtracting a negative number is the same as adding a positive number.
6 - -5 becomes 6+5=11
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