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

Evaluate the following: 3 x 6 + 2 x 10 What is your answer?

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 $10.00. How much did the Baker family pay to go to the movies?

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

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.

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 

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

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

What should be solved first? 5 + 4 + 2 x 5 – 6 = 9  3 + 5 x 3 - 1 = 7 x 3 – (9 + 4) + 5 =

What should be solved first? 6 – 4 + 6 + 16 = (6 – 4) + (7 x 6) + 10  5 = 40  4 - (3 + 5 x 2 - 7) = Stopped here with 7-2

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

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

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

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

Homework Questions 2 x (3 x 7 ) – 5 (15 – 5) + 5 x 3 (6 x 23) – 10 5 + ( 6 + 33) (10 + 9 – (4 x 7)  4)