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1-3 ORDER OF OPERATIONS MS. BATTAGLIA – ALGEBRA 1 CP OBJECTIVE: USE THE ORDER OF OPERATIONS AND EVALUATE VARIABLE EXPRESSIONS.

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WARM UP Compare the quantities in Column A and Column B. Column AColumn B The total cost of items bought by a customer The change the customer receives when paying with a $10 bill. A.The quantity in Column A is greater. B.The quantity in Column B is greater. C.The quantities are equal. D.The relationship cannot be determined from the information given.

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WORK WITH A PARTNER… Two formulas for the perimeter of a rectangle are P = 2l + 2w and P = 2( l + w ) 1)Let l = 12 and w = 8. Find the perimeter of the rectangle using each formula. 2)When you used the formula P = 2l + 2w, did you add first or multiply first? 3)When you used the formula P = 2 (l + w), did you add first or multiply first? 4)Which formula do you prefer to use? Why?

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DISCOVER… Solve 3 + 5 – 6 ÷ 2 Solve 3 + 5 – 6 ÷ 2 using division from left to right. then addition, then subtraction.

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ORDER OF OPERATIONS From left to right

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QUICK REVIEW!! An exponent indicates repeated multiplication. 3 4 = 3 3 3 3

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EXAMPLE Which operation should you do first to simplify each expression? 1.3 + 6 4 ÷ 2 2.3 6 – 4 2 3.3 (6 – 4) ÷ 2 4.3 ÷ 2 6

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Find the total cost of the sneakers shown in the ad. Use p + r p price sales tax sales tax rate Evaluate an expression with variables by substituting a number for each variable.

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EXAMPLE Evaluate 3a 2 – 12 ÷ b for a = 7 and b = 4

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EXAMPLE Evaluate each expression for c = 3 and d = 2 a) cd 2 b) (cd) 2

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EXAMPLE Write an expression for each phrase. a) Four times three, squaredb) The square of three, times four

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HOMEWORK P. 17-18 #2 – 12 even, 18,20,26,28

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