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1-3 Order of operations

1-3 Order of operations. Ms. Battaglia – Algebra 1 CP Objective: Use the order of operations and evaluate variable expressions. . Warm up. Compare the quantities in Column A and Column B . The quantity in Column A is greater. The quantity in Column B is greater. The quantities are equal.

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1-3 Order of operations

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  1. 1-3 Order of operations Ms. Battaglia – Algebra 1 CP Objective: Use the order of operations and evaluate variable expressions.

  2. Warm up • Compare the quantities in Column A and Column B. The quantity in Column A is greater. The quantity in Column B is greater. The quantities are equal. The relationship cannot be determined from the information given.

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

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

  5. Order of operations • From left to right

  6. Quick review!! An exponent indicates repeated multiplication. 34 = 3  3  3  3

  7. example Which operation should you do first to simplify each expression? 3 + 6  4 ÷ 2 3  6 – 42 3  (6 – 4) ÷ 2 3 ÷ 2 6

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

  9. example Evaluate 3a2 – 12 ÷ b for a = 7 and b = 4

  10. example Evaluate each expression for c = 3 and d = 2 a) cd2 b) (cd)2

  11. example • Write an expression for each phrase. • a) Four times three, squared b) The square of three, times four

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

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