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. 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.

1-2 HOMEWORK SOLUTIONS P #2, 4, 6, 8, 10, 14, 16, 20, 21, 22, 30, 31 2) 416) s=½e 4) 120) a) yes 3x2=6 6) A letter that represents b) yes 3+3=6 a number.21) b) 1 lawn: 2 hours 8) p=perimeter, s=side; p=4s 2 lawns: 4 hours 10) n=number of slices left, 5 lawns: 10 hours e=number of slices eaten; 22) a) f=½d n=8 – e b) 10 ft 14) c=8.50t30) 731) 7

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?

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

ORDER OF OPERATIONS From left to right

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

EXAMPLE Which operation should you do first to simplify each expression?  4 ÷  6 –  (6 – 4) ÷ ÷ 2  6

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. 7%

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

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

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

CLASSWORK Card Matching Game

HOMEWORK P #2 – 12 even, 18,20,26,28