1. Order of Operations Lesson 1.9 Page 24-25

2. Lesson 1.9: Order of Operations (pg. 24-25) 09/19/08 6R Lesson 1.9: pg. 25, # 6-22 09/19/08 6L Standards:

3. CA Content Standards Algebra and Functions 1.4: We solve problems manually by using the correct algebraic order of operations or by using a scientific calculator.

4. Lesson 1.9: Order of Operations (pg. 24-25) 09/19/08 6R Lesson 1.9: pg. 25, # 6-22 09/19/08 6L Standards: Vocabulary: None. Objective:

5. Evaluate numerical expressions and solve problems using several operations in the correct order. Math Link: You can add, subtract, multiply, and divide whole numbers. Now you will learn how to evaluate expressions using several operations.

6. Lesson 1.9: Order of Operations (pg. 24-25) 09/19/08 6R Lesson 1.9: pg. 25, # 6-22 09/19/08 6L Standards: Vocabulary: None. Objective: Notes/ Examples:

7. Consider this Scenario: Mark and Teresa are taking the same test in their math class and both are ABSOLUTELY SURE they’ve solved problem # 6 correctly! … but their answers don’t match! Take a look at their solutions below. MarkTeresa 3 +4 x 53 + 4 x 5 = 7 x 5= 3 + 20 = 35= 23 Who do you agree with?

8. Order of Operations To make sure everyone gets the same answer, we have a set of rules called the order of operations: Compute all values in parentheses first. Simplify exponents. Multiply and divide from left to right. Add and subtract from left to right. 3 + 4 x 5 Who was right? Mark or Teresa?

9. Evaluate 17 – (3 + 1) ÷ 2 Add in parentheses.17 – (3 + 1) ÷ 2 Divide. 17 – 4 ÷ 2 Subtract. 17 – 2 15 Example 1.

10. Evaluate 12 – 72 ÷ 8 + 3. Example 2.

11. Evaluate 14 – 3 x 2 + 7. Example 3.

12. Example: Story Problem On a class trip, Zachary visited 3 museums and 1 monument. Museum tickets were $2.50 each. The monument ticket was $2.00. How much did Zachary spend for tickets? Example 4.

13. Lesson 1.9: Order of Operations (pg. 24-25) 09/19/08 6R Lesson 1.9: pg. 25, # 6-22 09/19/08 6L Standards: Vocabulary: None. Objective: Notes/ Examples: Moral of the Story:

14. The Moral of the Story The order of operations rules tell you how to evaluate any expression with or without parentheses. Just remember to… PLEASE EXCUSE MY DEAR AUNT SALLY!