Adding and Subtracting positive and negative numbers

1 Integers are whole numbers. They can
be positive or negative. Positive numbers
are above zero and negative numbers
are below zero.

2 Example:

2.1 The temperature at 2am was -3.
By 2pm it had risen 10 degrees.
What was the new temperature?
-3 + 10=7 degrees

3 Adding a negative number is the same as subtracting a positive number.
6+-4 is the same as 6-4=2

4 Subtracting a negative number is the same as adding a positive number.
6 - -5 becomes 6+5=11