21 st Century Lessons Writing Algebraic Expressions 1

Warm Up-Matching OBJECTIVE: SWBAT write an algebraic expression from a written expression. Agenda 2 Choose the numerical expression that best matches each written expression. a) the product of 9 and 3 b) 9 subtracted by 3 c) 9 divided by 3 d) the sum of 3 and 9 1) 2) 3) 4) Written Expression Numerical Expression LANGUAGE OBJECTIVE: SWBAT discuss the difference between algebraic and written expressions.

Agenda: 1) Warm Up 2) Launch 3) Explore 4) Practice 5) Assessment 3 OBJECTIVE: SWBAT write an algebraic expression from a written expression. LANGUAGE OBJECTIVE: SWBAT discuss the difference between algebraic and written expressions. Matching-Independent Operations to Words-Groups Mini Lesson-Whole Class Matching Expression-Whole Class and Partners Exit Slip-Independent and Partners Agenda

Launch-Operations to Words 4 Agenda AdditionSubtractionMultiplicationDivision Directions: Put each word from the list into the operation’s box that it most likely expresses. plus sum more than in all increased by minus less than difference subtract decreased by times of product each multiplied divided per quotient twice ratio less factors separate PC Users

Launch- Mac User 5 Agenda AdditionSubtractionMultiplicationDivision Directions: Put each word from the list into the operation’s box that it most likely expresses. plus sum more than in all increased by minus less than difference subtract decreased by times of product each multiplied divided per quotient twice ratio less factors separate plus sum more than in all increased by minus less than difference subtract decreased by times of product each multiplied divided per quotient twice ratio less factors separate Next Slide

Launch- PC User 6 Agenda AdditionSubtractionMultiplicationDivision Directions: Put each word from the list into the operation’s box that it most likely expresses. plus sum more than in all increased by minus less than difference subtract decreased by times of product each multiplied divided per quotient twice ratio less factors separate plus sum more than in all increased by minus less than difference subtract decreased by times of product each multiplied divided per quotient twice ratio less factors separate AdditionSubtraction Multiplication Division Click below to reveal the words for each operation. Click each word to place it in the correct operation

Explore-Mini Lesson 7 Agenda The product of ten and seven. The product of ten and five. Write the following as a The product of ten and a number. Think…what can we use to represent a number when we don’t know the number? VARIABLE or Click to reveal next part numerical expression.

Explore 8 Agenda Write the following as a or Click to reveal next part Numerical Expression: an expression containing one or more numbers and operations i.e numerical expression. Click to Return

Explore- Mini Lesson 9 Agenda The product of ten and a number. Variable: a letter or symbol that represents an unknown quantity. Now, for my next trick, I will introduce a new way to write multiplication. A number written next to a variable means multiplication. Write as a algebraic expression.

10 This new expression, 10n, is called an Algebraic Expression. Algebraic Expression: an expression containing at least one variable. Numerical Expression: an expression containing one or more numbers and operations. Explore- Mini Lesson Click to reveal next part Agenda

11 Written Expression: an expression written with words. Variable: any letter in the alphabet or symbol that represents an unknown quantity. Explore- Mini Lesson The sum seventeen and number Three times the difference of nine and seven Agenda

12 Write an algebraic expression for the problems below. a) The sum of ten and a number. b) The quotient of a number and twelve. c) Eleven decreased by five times a number. Practice- Whole Class Important!!!! Identify the operation(s) by underlining key words. Agenda

13 Agenda Name ________________Date ___________ Class Work: Written Expressions vs. Algebraic Expressions Directions: Match the written expressions in Column A with the algebraic expressions in Column B. COLUMN ACOLUMN B The sum of a number and ten Ten divided by a number Eight less than twice a number The product of ten and a number increased by eight The quotient of a number and eight Ten decreased by three times a number The product of eight and a number Eight increased by a number Practice- Partners

14 Agenda Class Work: Written Expressions vs. Algebraic Expressions Directions: Match the written expressions in Column A with the algebraic expressions in Column B. COLUMN A COLUMN B Practice- Summary The product of ten and a number increased by eight The sum of a number and ten The quotient of a number and eight Eight less than twice a number Ten divided by a number Ten decreased by three times a number Eight increased by a number The product of eight and a number A number decreased by ten Ten more than twice a number

Assessment- Exit Slip 15 Agenda Directions: 1) Write your own algebraic expression using n, 3, 5. You must use at least 2 operations. 2) Translate your algebraic expression into a written expression. 3) Turn and Talk: Read your written expression to your partner. Have your partner write the algebraic expression. Switch roles. 3)

Which of the following expressions represents 7 times a number decreased by 13? 1.7x x x x Answer Now

Which one of the following expressions represents 28 less than three times a number? x 2.3x x 4.3x + 28 Answer Now

Write a verbal expression for: 1) 8 + a. The ratio of m to r Do you have a different way of writing these? The sum of 8 and a 2)

Which of the following verbal expressions represents 2x + 9? Answer Now 1.9 increased by twice a number 2.a number increased by nine 3.twice a number decreased by less than twice a number

Which of the following expressions represents the sum of 16 and five times a number? Answer Now 1.5x x x x

Which of the following expressions represents four less than the cube of a number? Answer Now 1.4 – x – 3x 3.3x – 4 4.x 3 – 4