1. SECTION 1-5 : ADDING and SUBTRACTING REAL NUMBERS
ALGEBRA I @
SECTION 1-5 : ADDING and SUBTRACTING REAL NUMBERS

2. At the end of this lesson you should be able to find the sums and differences of Real Numbers.

3. ADDITION RULES Examples….
SAME SIGNS DIFFERENT SIGNS Keep signs Use sign of larger Add number Subtract
Examples….

4. SUBTRACTION RULE
Add the opposite or
Keep – Change - Change
Examples…

5. Find each sum or difference.
1) (-23)
ANSWER : 11
2) (-39)
ANSWER : -51
3) -17 – 25
ANSWER : -42
4) – 2.9
ANSWER : -20.5
5) – (-22.9)
ANSWER : 8.2

6. 6) –
ANSWER : 5.6
ANSWER : -1/2
ANSWER : 23/18
ANSWER : 3 19/28

7. ALGEBRA I - SECTION 1-5 (Adding and Subtracting Real Numbers)
10) Evaluate if a = and b = a - b
ANSWER : -0.9
ANSWER : -1/35

8. 12) John is the running back for Doh High School
12) John is the running back for Doh High School. He had the following runs in the last football game :
gain 4 yards, lost 3 yards, gain 16 yards, gain 3 yards, no gain, lost 5 yards, gain 8 yards, gain 22 yards, lost 3 yards.
What is John’s total yards for the game?
ANSWER : +42 yards

9. As you can see, John is #1 in math also.