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Section 1.3 : Order of Operations Objective: Students will be able to use the order of operations to evaluate expressions. Main Ideas/ Questions Vocabulary Notes/Examples Order of Operations: set of _____________ Used to _____________ ______________ involving more than one ________________. Examples Using Grouping Symbols Evaluate the expressions using Order of Operations. 1. 14 + 6 12 - 7 2. 5[36 - (13 + 9)] Practice Evaluate the expression 1. 28 - 63 ÷ 7 2. 2. 72 ÷ [(11 - 7)⋅2] Example Evaluate variable expressions Evaluate the expression when x = 2 and y = 5. 4(x+y) Practice Evaluate the expression when x = 4 and y = 2. 1. 3x - 2y 2. x2 - y 3. 3(x+y)2 Example Write and Evaluate an Expression using Order of Operations You buy a pattern and enough material to make two pillows. The pattern costs $5. Each pillow requires $4 worth of fabric and a button that costs $.50. Find the total cost. Solution: Step 1: Read and understand the problem. Step 2: Write a verbal model. Step 3: Solve the problem. The total cost is ________________________. Practice A boojum is a very slow-growing cactus. One fiftyyear-old boojum is 1.5 meters tall and has been growing about 0.03 meter each year. Assume the growth pattern continues. a. Write an expression for the height in meters of the boojum y years from now. b. Apply How tall will the boojum be in 50 years?