1. Chapter 2.2 – Properties of
Addition
Textbook Pages 60-63

2. Adding Integers
A football team gains 7 yards on their first
play, then loses 9 yards on the next play,
then loses 1 yards on their third play. What
is their total yardage for all three plays?
Rules:
Same sign: Add the numbers, keep the sign
Different sign: Subtract the numbers, keep the
sign of larger number (not considering the sign)

3. Example 1:Add
• 1 + (-2)
• (-8) + 5
• (-2) + (-4)
• -13 + 5 + (-7)
• -12.6 + 7.3

4. Example 2:evaluate
• 3 + x + (-7); x = -6
• -14 + x + 14; x = 9

5. Properties (Axioms) of Addition

6. Identifying properties
(Algebraic Proof)

7. Identifying properties
(Algebraic Proof)