2. Order of Operations Jessica Bentley 7 th grade Math Let’s Begin! Let’s Begin!

3. Learning Objectives Students will be able to: Restate the basic rules of order of operations. Recognize the need for the order of operations in mathematics. Evaluate arithmetic using the order of operations. Apply order of operations rules to complete exercises Back Next

4. Please Excuse My Dear Aunt Sally P. = Parentheses E. = Exponents M.= Multiply* D.= Divide* A.= Addition** S. = Subtraction** *You multiply and divide from left to right **You add and subtract from left to right Next!

5. Let’s put our knowledge to the test and solve this problem: 2+3(6+1) 2 =? 1 st step: Parentheses: 2+3(6+1) 2 = 2 nd step: Exponents: 2+3(7) 2 = 3 rd step: Multiply and Divide: 2+3(49)= 4 th step: Add and Subtract: 2+14=149 Next!

6. Why we use P.E.M.D.A.S When we use P.E.M.D.A.S: 2+3(6+1) 2 = 2+3(7) 2 = 2+3(49)= 2+147= 149 Correct!! If you move from left to right: 2+3(6+1) 2 = 6+(6+1) 2 = 6+7 2 = 6+49= 55 Incorrect Let’s Practice! Let’s Practice!

7. 27 115 33 45

8. WAY TO GO! YOU’RE CORRECT!! 9+6x(8-5)= Parentheses Exponents 9+6x3= Multiply/Division 9+18= Addition/Subtraction = 27! Next!

9. OH NO!! TRY AGAIN! HINT! Are you using Please Excuse My Dear Aunt Sally? Parentheses Exponents Multiply/Divide Addition/Subtraction Give it another shot ! Give it another shot !

10. OH NO!! TRY AGAIN! HINT! Are you using Please Excuse My Dear Aunt Sally? Parentheses Exponents Multiply/Divide Addition/Subtraction Give it another shot ! Give it another shot !

11. Solve: 9-5÷(8–3)x2+6 15 24 34/5 13

12. YOU ROCK! 9-5÷(8–3)x2+6 = Parentheses Exponent 9-5÷5x2+6= Multiply/Divide (L-R) 9-1x2+6= Multiply/Divide (L-R) 9-2+6= Addition/Subtraction (L-R) =13 Done! Again!

13. References  http://www.mathgoodies.com/cd/Objectives/objec tives_vol7.html http://www.mathgoodies.com/cd/Objectives/objec tives_vol7.html  http://teachermuse.blogspot.com/ http://teachermuse.blogspot.com/