## Lesson: Adding and Subtracting With Negative Integers

Developing the Concept

Now that the students have had an opportunity to refresh their memories about adding and subtracting integers on a number line, it is time for them to use the rules to find sums and differences of integers.

Have them find the answers to the following: 31 − (^{-}21);
^{-}18 − (^{+}23);
^{-}21 − (^{-}17).