Intro to Order of Operations (O-O-O) Ms. Stewart Math 7 COPY SLIDES WHEN YOU SEE THIS

Evaluate the following:  3 x 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 $ How much did the Baker family pay to go to the movies?

Taking Another Look  3 x x 10 = 3 children… … at $6 each 2 adults… … at $10 each added to $3 8

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 BEDMAS.

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

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?  x 5 – 6 =  9  x =  7 x 3 – (9 + 4) + 5 =

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

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

Evaluate the following: 1. (6 + 3) x 2 – x 2 2. (30 + 8) – 3 x (4 + 6) 3. (4 + 6 x 2 – 9) x 2 – x 2  3 x  2 – 4 x x (4 – 3 + 2) 6. (8 – 3) + 5 x 2

Adding Brackets  – 5 x 2 = 6  x 4 – 9 = 35  x 8 – 6 = 19  x 2 = 20

Adding Brackets  x 3 – 1 = 15  x 2 = 21  7 x 3 – = 16  26 – 5 x 4  2 = 3  x 3 – 1 = 14

Homework Questions 1. 2 x (3 x 7 ) – 5 2. (15 – 5) + 5 x 3 3. (6 x 2 3 ) – ( ) 5. ( – (4 x 7)  4)