1. Addition of Signed Numbers

2. Adding Integers with the Same Sign:
To add integers with the same sign, keep their common sign and add their absolute values.
Review: Absolute value is the distance from zero to the number on the number line.

3. Review of Absolute Value:

4. Examples
4 + 6 = 10 (both numbers are positive so keep the positive sign and add the absolute values)
= -12 (both numbers are negative so keep the negative sign and add the absolute values)

5. Examples = = =

6. Adding Integers with Different Signs:
To add integers with different signs, keep the sign of the larger absolute value number and subtract the absolute values.
= 2 (notice that the absolute value of 7 is greater than the absolute value of 5, so the answer will be positive)

7. Examples
2 + (-3) =
74 + (-65) = = =

8. Examples
-4 + (-5) =
9 + (-12) = =
-56 + (-45) =