M 1-1 Alg Expressions & Order Of Ops

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By: lindaryland (117 month(s) ago)

I really enjoyed your presentation. The one I prepared last year was lost along with my zip drive. Please send me a copy to use. linda.ryland@pgcps.org

By: satir (121 month(s) ago)

very good ppt

By: sandeep2011 (123 month(s) ago)

good lecture.

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1-1Algebraic Expressions & Order Of Operations : 

1-1Algebraic Expressions & Order Of Operations Variable—A symbol, usually a letter, that represents one or more numbers. Algebraic Expression—A mathematical sentence consisting of: 1. Numbers 2. Variables 3. Operation Symbols **NOTE** THERE ARE NO EQUAL SIGNS! An equal to symbol would make the expression an EQUATION!

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Order Of Operations—The sequence in which expressions are simplified or evaluated. 1. Parentheses 2. Exponents 3. Multiplication and Division FROM LEFT TO RIGHT! 4. Addition and Subtraction FROM LEFT TO RIGHT! 1-1Algebraic Expressions & Order Of Operations

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Ex. 1. Write an algebraic expression for each word phrase. a. Five more than a number 5 + x x + 5 b. The number of minutes in p hours 60p 1-1Algebraic Expressions & Order Of Operations ALWAYS write addition expressions with VARIABLE FIRST!!! ALWAYS write multiplication expressions with VARIABLE SECOND!!! NO MULTIPLICATION SIGNS IN EXPRESSIONS USING VARIABLES!!

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c. The number of sandwiches (s) per person if there are 6 people s/6 d. $8 less than what your friend (f) makes f – 8 1-1Algebraic Expressions & Order Of Operations 6/s would be incorrect! “less than” ALWAYS means to SWITCH!! Ex. 1. Write an algebraic expression for each word phrase.

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1-1Algebraic Expressions & Order Of Operations Ex. 2. Evaluate each expression for n=6. a. 5n + 4 5(6) + 4 30 + 4 34 b. (3n – 2) ÷ 4 + 8n – 11 (3(6) – 2) ÷ 4 + 8(6) – 11 (18 – 2) ÷ 4 + 8(6) – 11 16 ÷ 4 + 8(6) – 11 4 + 8(6) – 11 4 + 48 – 11 41

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