# Lesson 18: Introduction to Algebra: Expressions and Variables

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1 LESSON 18: Algebra Expressions and Variables Weekly Focus: expressions Weekly Skill: write and evaluate Lesson Summary: For the Warm Up, students will solve a problem about movie tickets sold. In Activity 1, they will learn some basic algebra vocabulary. In Activity 2, students will write expressions. In Activity 3, students will do word problems in the workbook. In Activity 4, they will evaluate expressions. For the Application Activity, there are two options from which to choose depending on the time you have left and/or student needs. There is a Group Exit Ticket to end the class. Estimated time for the lesson is 2 hours. Materials Needed for Lesson 18: Video (length 8:50) on variables and expressions. The video is required for teachers and recommended for students. 2 worksheets (18.1, 18.2) with answers (attached) Mathematical Reasoning Test Preparation for the 2014 GED Test Student Book (pages 50-51) Mathematical Reasoning Test Preparation for the 2014 GED Test Workbook (pages 58-61) Tell students about this website for algebra practice, notes, and videos: Objectives: Students will be able to: Understand vocabulary related to algebraic expressions Translate verbal phrases into algebraic expressions Evaluate expressions for different values of the variables ACES Skills Addressed: N, CT, ALS CCRS Mathematical Practices Addressed: Model with Math, Reason Abstractly and Quantitatively Levels of Knowing Math Addressed: Intuitive, Concrete, Abstract, and Application Notes: You can add more examples if you feel students need them before they work. Any ideas that concretely relates to their lives make good examples. For more practice as a class, feel free to choose some of the easier problems from the worksheets to do together. The easier problems are not necessarily at the beginning of each worksheet. Also, you may decide to have students complete only part of the worksheets in class and assign the rest as homework or extra practice. The GED Math test is 115 minutes long and includes approximately 46 questions. The questions have a focus on quantitative problem solving (45%) and algebraic problem solving (55%). Students must be able to understand math concepts and apply them to new situations, use logical reasoning to explain their answers, evaluate and further the reasoning of others, represent real world problems algebraically and visually, and manipulate and solve algebraic expressions. This computer-based test includes questions that may be multiple-choice, fill-in-the-blank, choose from a drop-down menu, or drag-and-drop the response from one place to another. The purpose of the GED test is to provide students with the skills necessary to either further their education or be ready for the demands of today s careers. D. Legault, Minnesota Literacy Council,

2 Lesson 18 Warm-up: Solve the movie ticket problem Time: 10 Minutes Write on the board: A movie theatre owner wants to know if there is a relationship between the number of tickets sold and how long the movie has been playing. Here is how many tickets have been sold so far: 3,000 tickets sold Week 1; 2,750 tickets sold Week 2; 2,500 tickets sold Week 3; and 2,250 tickets sold Week 4. Basic Questions: Make a graph with the above information. o Give students time to make their graphs. They may make a line graph or a bar graph. The line graph should look like the example below. You can connect the dots to make a line of best fit or you can leave it as a scatter plot. Either way there is a negative correlation. What can the owner predict might happen on Week 5? (Attendance will be lower, there will be 2,000 tickets sold) Extension Questions: What is the average (mean) attendance for the first 4 weeks? (Total of 10,500 divided by 4 = 2,625 tickets sold per week) Is the correlation positive or negative? (It is negative because the more time goes by, the lower the ticket sales. Some students may say the slope is negative, which is true. Slope will be taught in a later lesson.) Lesson 18 Activity 1: Vocabulary Time: 10 Minutes 1) This activity can be projected on the board and done as a whole class. Have students volunteer to fill in the blank after everyone has a chance to do the activity. 2) Explain variable as a letter that takes the place of a number until we figure out what that number is. 3) The first example for 3 and 4 is numeric because there are no variables. 4) The second example for 3 and for 4 is algebraic because there is a variable. D. Legault, Minnesota Literacy Council,

3 5) Solicit more examples of each from students. Answers: 1. A variable is a letter or symbol used to write a value (number) that can change. 2. A constant is a value that does not change. 3. An equation is a math statement that shows the two sides are equal or balanced. 4. An expression is a combination of numbers and operations. constant expression variable equation 1. A is a letter or symbol used to write a value (a number) that can change. Some examples are x, y, a, c. 2. A is a value that does not change. Some examples are 56, 47, ½, An is a math statement that shows the two sides are equal. Some example are = 9 and 4 + x = 9 4. An is a combination of numbers and operations. Some examples are and 4 + x. Lesson 18 Activity 2: Write Expressions Time: Minutes 1) Write on the board: a b 5 x D. Legault, Minnesota Literacy Council,

4 y 16 2) Ask students how they would read aloud each of the expressions. a. For the first one, they may say: a plus 4, 4 added to a, the sum of 4 and a, 4 more than a, etc. b. For the second one, they may say 17 minus b, b subtracted from 17, the difference of 17 and b, b less than 17. (Note: This last one is tricky for students so add more examples if necessary. This example can be you have \$17 and I have less money and it s b fewer dollars). c. For the third one, they may say 5 times x, the product of 5 and x, etc. This expression can also be written as 5x, which is the case in algebra. Make sure to point this out. d. For the fourth one, they may say y divided by 16, the quotient of y and 16. 3) Do Worksheet Do the first few together on the board. Circulate to help. Have volunteers write answers on the board. 4) Do pages in the student book together. Page 50 has more examples of the above and on page 51 students also choose which expression best matches the problem. Lesson 18 Activity 3: Word Problems Time: Minutes 1) After you have done the problems in the student book together, students can work independently in the workbook pages ) You may need to review operations with integers from a previous lesson because there are some negative numbers in some of the problems. 3) Circulate to help. Discuss and explain the questions that students found challenging. Validate correct reasoning and redirect/explain if reasoning is not correct. Lesson 18 Activity 4: Evaluate Expressions Time: 20 Minutes 1) Tell the students: You have just done many problems in which you had to match an expression to a word problem. Now we will learn to evaluate expressions for different variables. That means we will find the answer for different values. 2) Example A: You work h hours per week and make \$15 an hour. a. Write an expression to represent how much you get paid. (15h or 15 x h) b. Evaluate the expression for 10 hours in one week (15 x 10 = \$150) c. Evaluate the expression for 25 hours in one week (15 x 25 = \$375) D. Legault, Minnesota Literacy Council,

5 3) Example B: In the warm up activity about the movie ticket sales, the owner wants to know how much money she will make if the tickets are sold at \$11.25 each. a. Write an expression with t for tickets. (\$11.25t ) b. Evaluate the expression for the first week when 3,000 tickets were sold. (3,000 x \$11.25 = \$33,750) c. Evaluate the expression for the second week when 2,750 tickets were sold. (2,750 x \$11.25 = \$30,937.50) 4) Practice evaluating expressions with Worksheet Do the first few together. Application Option A: Make Algebra Concrete Time: 15 Minutes This activity may be useful to make algebraic more concrete for students. Use the following as a guideline. I wasn t able to change the words (document is a pdf) so choose items in the classroom and ignore the reference to child. Also, you can make the activity more interesting by saying a few examples yourself and then having students work in pairs to create an expression and dictate it to the rest of the class. D. Legault, Minnesota Literacy Council,

6 D. Legault, Minnesota Literacy Council,

7 Application Option B: Write Expressions from a Menu Time: 10 Minutes (See printable handout on the next page.) Use the menu from this restaurant to write an algebraic expression for each question. The variable is the first letter of the menu item. Once you write the variable, evaluate the expression. French Fries \$2 Pizza Slice \$3 Hotdog \$3 Ice Cream Sundae \$3 Shake \$2 Taco \$2 Coke \$1 Milk \$1 1. Mike ordered 3 hotdogs for his family. How much was the meal? 2. Stanley wants to eat an ice cream sundae after he finishes his meal of coke and a slice of pizza. How much was his bill? 3. There are four people in the Cullwell family. Two people order French fries and two people order tacos. Each one of them orders milk with their meal. How much do the drinks cost for the Cullwell family? 4. If the whole class decided to eat lunch, and the teacher bought everyone a taco and a shake, how much would the teacher have to pay? Answers: 1. 3h, 3(\$3)= \$9 2. c + p + i, \$1+\$3+\$3=\$7 3. 2f + 2t + 4m, 2(\$2) + 2(\$2) + 4(\$1) = \$12 4. Answer will vary D. Legault, Minnesota Literacy Council,

8 Writing Expressions from a Menu Use the menu from this restaurant to write an algebraic expression for each question. The variable is the first letter of the menu item. Once you write the variable, evaluate the expression. French Fries \$2 Pizza Slice \$3 Hotdog \$3 Ice Cream Sundae \$3 Shake \$2 Taco \$2 Coke \$1 Milk \$1 2. Mike ordered 3 hotdogs for his family. How much was the meal? 4. Stanley wants to eat an ice cream sundae after he finishes his meal of coke and a slice of pizza. How much was his bill? 5. There are four people in the Cullwell family. Two people order French fries and two people order tacos. Each one of them orders milk with their meal. How much do the drinks cost for the Cullwell family? 5. If the whole class decided to eat lunch, and the teacher bought everyone a taco and a shake, how much would the teacher have to pay? D. Legault, Minnesota Literacy Council,

9 Lesson 18: Group Exit Ticket Time: 5 Minutes Do expression dictation. For example, say 15 less than n. Have students write the answer on a piece of paper (n 15). You may continue with more dictations yourself or students can take turns saying the dictation problems for the whole class to write down. As each problem is said, students should write down the expression individually. D. Legault, Minnesota Literacy Council,

10 Kuta Software Lesson - Infinite 18: Algebra Introduction 1 to Algebra: Expressions Name and Variables Variable and Verbal Expressions Worksheet 18.1 Write Expressions Write each as an algebraic expression. 1) the difference of 10 and 5 2) the quotient of 14 and 7 Date Period 3) u decreased by 17 4) half of 14 5) x increased by 6 6) the product of x and 7 7) the sum of q and 8 8) 6 squared 9) twice q 10) the product of 8 and 12 11) the quotient of 18 and n 12) n cubed Write each as a verbal expression. 13) x 2 14) a ) ) 5n D. Legault, Minnesota Literacy Council,

11 Kuta Software Lesson - Infinite 18: Algebra Introduction 1 to Algebra: Expressions Name and Variables Variable and Verbal Expressions Worksheet 18.1 Answers Write each as an algebraic expression. Date Period 1) the difference of 10 and ) u decreased by 17 u ) x increased by 6 x + 6 2) the quotient of 14 and ) half of ) the product of x and 7 x 7 7) the sum of q and 8 q + 8 8) 6 squared 6 2 9) twice q 2q 10) the product of 8 and ) the quotient of 18 and n 18 n 12) n cubed n 3 Write each as a verbal expression. 13) x 2 half of x 14) a + 9 a increased by 9 15) 19-3 the difference of 19 and 3 16) 5n 5 times a number D. Legault, Minnesota Literacy Council,

12 Kuta Software Lesson - Infinite 18: Algebra Introduction 1 to Algebra: Expressions Name and Variables Evaluating Expressions Worksheet 18.2 Evaluate Expressions Evaluate each using the values given. 1) y 2 + x; use x = 1, and y = 2 2) a b; use a = 10, and b = 4 Date Period 3) p 2 + m; use m = 1, and p = 5 4) y x; use x = 1, and y = 3 5) m + p 5; use m = 1, and p = 5 6) y 2 - x; use x = 7, and y = 7 7) z(x + y); use x = 6, y = 8, and z = 6 8) x + y + y; use x = 9, and y = 10 9) p m; use m = 9, and p = 3 10) 6q + m - m; use m = 8, and q = 3 11) p 2 m 4; use m = 4, and p = 7 12) y - (z + z 2 ); use y = 10, and z = 2 13) z - (y 3-1); use y = 3, and z = 7 14) (y + x) 2 + x; use x = 1, and y = 1 D. Legault, Minnesota Literacy Council,

13 Kuta Software - Infinite Algebra 1 Name Evaluating Expressions Worksheet 18.2 Answers Evaluate each using the values given. Date Period 1) y 2 + x; use x = 1, and y = 2 2 2) a b; use a = 10, and b = 4 1 3) p 2 + m; use m = 1, and p = ) y x; use x = 1, and y = ) m + p 5; use m = 1, and p = 5 2 6) y 2 - x; use x = 7, and y = ) z(x + y); use x = 6, y = 8, and z = ) x + y + y; use x = 9, and y = ) p m; use m = 9, and p = ) 6q + m - m; use m = 8, and q = ) p 2 m 4; use m = 4, and p = ) y - (z + z 2 ); use y = 10, and z = ) z - (y 3-1); use y = 3, and z = ) (y + x) 2 + x; use x = 1, and y = 1 2 D. Legault, Minnesota Literacy Council,

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