1. Intro to Order of Operations (O-O-O)
Math 7/8
COPY SLIDES WHEN YOU SEE THIS

2. Evaluate the following:
3 x x 10
What is your answer?

3. Try Again!
Mr. and Mrs. Baker and their three children went to the movies. The cost for a child was $6.00 and the cost for an adult was $ How much did the Baker family pay to go to the movies?

4. Taking Another Look 3 x 6 + 2 x 10 = $38 …at $10 each …at $6 each
3 children…
2 adults…
added to

5. Order of Operations
When calculating equations with mixed operations(+, -, x, ) everyone must agree to follow the same rules; otherwise different people will get different answers.
Mathematicians have come up a set of rules. We call these rules, “Order of Operations”.
To help us remember the rules we use the word PEMDAS.

6. BEDMAS~Order of Operation Rules Read Left to Right
You complete all operations inside the brackets first.
P ~ Parenthesis
E ~ Exponents
M ~ Multiplication
D ~ Division
A ~ Addition
S ~ Subtraction
You do ALL exponents in the order they appear.
You do ALL x and  in the order they appear.
You do ALL adding and subtracting in the order they appear. You do not do any + or – until you have completed all x and 

7. Brackets
Brackets tell us that certain things belong together. What would you rather have?

8. Brackets
Brackets also tell us to do what is inside first.

9. What should be solved first?
x 5 – 6 =
9  x =
7 x 3 – (9 + 4) + 5 =

10. What should be solved first?
6 – =
(6 – 4) + (7 x 6) + 10  5 =
40  4 - (3 + 5 x 2 - 7) =
Stopped here with 7-2

11. What should be solved first?
4 – x 10  5 =
8  4 + (7 + 6) + 3 x 2 =
(4  2 x 3 + 8) - 2 x 7 =

12. Evaluate the following:
(6 + 3) x 2 – x 2
(30 + 8) – 3 x (4 + 6)
(4 + 6 x 2 – 9) x 2 – 10
6 + 3 x 2  3 x  2 – 4 x 2
2 x (4 – 3 + 2)
(8 – 3) + 5 x 2

13. Adding Brackets 4 + 6 – 5 x 2 = 6 5 + 6 x 4 – 9 = 35

14. Adding Brackets 7 + 4 x 3 – 1 = 15 3 + 5 + 4 x 2 = 21

15. Homework Questions 2 x (3 x 7 ) – 5 (15 – 5) + 5 x 3 (6 x 23) – 10
5 + ( )
( – (4 x 7)  4)