Aim: How can we remember the order of operations?

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Presentation transcript:

Aim: How can we remember the order of operations? October 19, 2009 Math 102 Objective: Students will use the order of operations to simplify expressions. Aim: How can we remember the order of operations? NYS Mathematics Standards: 7.N.11 Prior Knowledge: Find the value of each expression: 5 + 11= 19 + (-8) = -24 / 2 = 21 – (-7) = -5 – 7 = -6 / -2 = 8 x 7 = 3 x -7 = -56 / -9 =

+ - X / 25 Mini-lesson: (parentheses) 1. Simplify grouping symbols Order of Operations Symbol 1. Simplify grouping symbols (parentheses) 2. Simplify exponents exponent 25 base 3. Multiply and divide in order from left to right X / 4. Add and subtract in order from left to right + -

Guided Practice: Find the value of 13 x (5-2) + 42 Simplify grouping symbols 13 x 3 + 42 = Simplify exponents 13 x 3 + 16 = Multiply and divide in order from left to right 39 + 16 = Add and subtract in order from left to right 55

Guided Practice: When simplifying an expression, what is the first symbol you should look for? When multiplying and dividing, in what direction do you work? In the expression, 24 + 16 / 2 x 2, what operation is done first?

(Mr. Brooks will model in class) Turn to page 361, problem 5 (Mr. Brooks will model in class) Now you tell Mr. Brooks (raise your hand!) how to fill in the blanks for Problems 6 and 7 Independent Practice Complete exercises 19,25, 29, 32 and 35, while Mr. Brooks visits each student to review his/her work. Homework Lesson 8 – 7 Homework Practice worksheet