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Variables and Expressions

Variables and Expressions. Lesson 1-1 Pg. 4-7. Pre-Algebra Development Table of Contents. Date Title Page #. 08/15/11 Pre-Algebra Activity Training 1 08/17/11 Variables and Expressions 2. 8/17/11. 8/17/11. Observe, Question, Comment .

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Variables and Expressions

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  1. Variables and Expressions Lesson 1-1 Pg. 4-7

  2. Pre-Algebra Development Table of Contents Date Title Page # 08/15/11 Pre-Algebra Activity Training 1 08/17/11 Variables and Expressions 2

  3. 8/17/11 8/17/11 Observe, Question, Comment Lesson 1-1: Variables and Expressions (Pg. 4-7) Lesson 1-1: Independent Practice Warm-Up: 2R 2L

  4. Warm-Up

  5. 8/17/11 8/17/11 Observe, Question, Comment Lesson 1-1: Variables and Expressions (Pg. 4-7) Lesson 1-1: Independent Practice Warm-Up: Standards: 2R 2L

  6. CA Content Standards • Algebra and Functions 1.4: Use algebraic terminology correctly.

  7. 8/17/11 8/17/11 Observe, Question, Comment Lesson 1-1: Variables and Expressions (Pg. 4-7) Lesson 1-1: Independent Practice Warm-Up: Standards: Objective: 2R 2L

  8. Objective: • To identify variables, numerical expressions, and algebraic expressions. • To write algebraic expressions for word phrases. • Why Learn This:To use the language of algebra to model real-world problems.

  9. 8/17/11 8/17/11 Observe, Question, Comment Lesson 1-1: Variables and Expressions (Pg. 4-7) Lesson 1-1: Independent Practice Warm-Up: Standards: Objective: Notes/ Examples: 2R 2L

  10. Addition Subtraction Terms that represent… Multiplication Division

  11. Algebraic vs. Numerical Expressions • Five minus five 5-5 • One thousand divided by twenty 1000/ 20 ________________________________________ • A variable plus c n + c • Twenty- three multiplied by a number 23n

  12. Identify: Numerical vs. Algebraic • Warm-Up Problems • 8 ÷ x • 100 x 6 • D + 43 – 9 • 7 x 3 • 4t

  13. Translation • Nine more than a number y • 4 less than a number n • A number z times three • A number a divided by 12 • 5 times the quantity 4 plus a number c

  14. Write an algebraic expression for each word or phrase. a. A temperature of t degrees increased by 5 degrees t + 5 b. A price p decreased by 16 p-16 c. The product of 5 and n nickels 5n d. 6 less than d dollars d – 6 d. 12 times b boxes 12b I Do: Writing Algebraic Expressions

  15. Write an algebraic expression for each word or phrase. a. Swimming m meters per minute for 3 minutes 3m b. 3 cats fewer than g cats g - 3 c. A dinner bill of d dollars divided among 5 friends d/ 5 d. The total cost of 4 apples and 6 bananas; apples cost a cents each, and bananas cost b cents each. 4a + 6b We Do: Writing Algebraic Expressions

  16. Write an algebraic expression for each word or phrase. a. Six goals fewer than g goals g - 6 b. P people increased by 2 p + 2 c. Four more than s shirts s + 4 d. The quotient of p and 5 p/5 e. The sum of t TVs and 11 TVs t + 11 f. Five times your quiz score q 5q You Do: Writing Algebraic Expressions

  17. Interactive Practice • Algebraic Expression Review Matrix

  18. 8/17/11 8/17/11 Observe, Question, Comment Lesson 1-1: Variables and Expressions (Pg. 4-7) Lesson 1-1: Independent Practice Warm-Up: Standards: Objective: Notes/ Examples: Vocabulary: 2R 2L

  19. Vocabulary: VARIABLE • ‘Own Definition:’ • ‘Class Definition:’ • A symbol that represents one or more numbers. • Variables are usually letters.

  20. Vocabulary: ALGEBRAIC EXPRESSION • ‘Own Definition:’ • ‘Class Definition:’ • Amathematical phrase with at least one variable, an unknown value. Algebraic expressions are used to represent word phrases.

  21. 8/17/11 8/17/11 Observe, Question, Comment Lesson 1-1: Variables and Expressions (Pg. 4-7) Lesson 1-1: Independent Practice Warm-Up: Independent Practice: Standards: Objective: Notes/ Examples: Vocabulary: 2R 2L

  22. Independent Practice:

  23. 8/17/11 8/17/11 Observe, Question, Comment Lesson 1-1: Variables and Expressions (Pg. 4-7) Lesson 1-1: Independent Practice Warm-Up: Independent Practice: Homework: Standards: Objective: Notes/ Examples: Vocabulary: 2R 2L

  24. Assignment #2 Write an expression for each word phrase. Then identify each expression as a numeric expression or an algebraic expression. • The total of h and 56 • Three less than d • Five decreased by three • a divided by seven

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